PLC To Deltav Systems Migration
PLC To Deltav Systems Migration
PLC To Deltav Systems Migration
www.EmersonProcess.com/DeltaV
DeltaV Whitepaper
March, 2012 Page 2
Table of Contents
Introduction .............................................................................................................................. 3 Integration Options.................................................................................................................. 3 Serial .................................................................................................................................... 3 Industrial Ethernet ................................................................................................................ 5 OLE for Process Control (OPC) ........................................................................................... 7 Comparison of Serial, Industrial Ethernet and OPC ............................................................. 8 Migration Options .................................................................................................................... 8 Migrate Supervisory Functions ............................................................................................. 8 Migrate Control Use PLC as I/O Multiplexer ...................................................................... 9 Migrate Control Integrate PLC I/O via I/O Interface ......................................................... 10 Migrate Control Replace I/O Keep Device Wiring ........................................................ 12 Transition Services ............................................................................................................... 12 Database Conversion ......................................................................................................... 12 Display Conversion ............................................................................................................ 12 Managing Risk ....................................................................................................................... 13 Summary ................................................................................................................................ 13
DeltaV Whitepaper
March, 2012 Page 3
Introduction
Programmable Logic Controller (PLC) service in process industries began as an alternative to hardwired relay systems for sequencing controls and safety systems. PLC usage increased with the addition of analog control capability. As Original Equipment Manufacturers (OEMs) adapted skid based equipment to include preengineered PLCs, this convenient equipment and controls combination propagated rapidly. Sites implementing skids from different OEM suppliers may have an array of PLC models with various control, Human Machine Interface (HMI), alarm, and historian packages. Upgrading such PLCs tends to be cost prohibitive, as OEM PLCs typically have minimum control and data capabilities to meet a price point. Thousands of PLCs are approaching 100,000 hours in service, over 11 years of continuous operation. Beyond this age, higher failure rates are likely and replacement parts availability is declining. PLC replacement in kind will likely add a second control platform, which includes separate controller and HMI databases. Whereas, modernizing with a new automation system, such as the DeltaV system consolidates configuration of the HMI and controllers in a single database. Other advantages include data integration, asset management, advanced controls, and improved diagnostics. This paper examines techniques for PLC to DeltaV system modernization through integration or migration. Integration refers to a physical connection and software application for passing data between your older PLC and a new DeltaV system. Migration implies removing functionality from your PLC based system and implementing it in a new DeltaV system. Solutions may combine integration and migration. For example, one may migrate critical PLC shutdown logic into a new DeltaV SIS application, and for non-critical plant areas, integrate PLC I/O with DeltaV controllers. We first will examine integration methodologies and supporting technologies, followed by migration options and transition services.
Integration Options
Integration between two control systems requires communication protocols and hardware devices compatible with each end control device. For DeltaV system integration, three widely used protocols are Serial, Industrial Ethernet and Object Linking and Embedding for Process Control (OPC). Here we present typical architectures and applications supported by each of these protocols, specifically for data exchange with PLC based systems.
Serial
Since the 1970s, serial interfaces have connected PLCs and other devices to control systems. Serial integration is a proven communication method with countless industrial applications. Serial, by far, is the most widely applied system integration communications protocol. Physically, the serial interface connects a DeltaV serial card to a PLC serial communication module, for a single or multiple PLC network nodes, as shown in Figures 1 and 2.
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Tight integration provided by a serial link enables you to implement a wide variety of functions in the DeltaV system. You can keep regulatory control in the PLC or change its programming so it becomes an I/O multiplexer. Example applications for serial connectivity are shown in the following table: DeltaV system role Advanced Control Advanced Batch Supervisory Operations Regulatory Control DeltaV Device Workstation or Controller PLC CPU Role
Controller
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You may combine these DeltaV applications. Another option is to expand DeltaV control functions and utilize any spare PLC I/O capacity. DeltaV serial cards support 128 PLC datasets, with 100 registers per dataset and can be installed as simplex or redundant. Serial interface is an economical, stable, easy to use integration method for data rates of ~100 data values/second.
Industrial Ethernet
Industrial Ethernet offers a step up from serial communications, with greater speed, increased capacity, faster response, and peer-to-peer architecture. Unlike Information Technology (IT) Ethernet, Industrial Ethernet utilizes rugged Commercial Off The Shelf (COTS) equipment, often in redundant configuration, for higher reliability in harsh environments. Because it is a switched network with a high bandwidth, Industrial IP has few contention issues. Higher speed, faster response time, and increased capacity of Industrial Ethernet introduce additional complexity, installation and configuration costs when compared to serial communications. Industrial Ethernet is less deterministic than serial buses originally designed for machine control. Three open protocols widely used for Industrial Ethernet Local Area Networks (LANs) are Modbus/TCP, Ethernet/IP, and Profinet I/O. The first two are utilized in the lion's share of DeltaV system integrations with PLC based systems. Data rates for these protocols range from 10-100 Mbps. Modbus/TCP is an Ethernet version of Schneider Electrics Modbus protocol. Modbus/TCP is used for nonPLC products, as well as PLCs. Ethernet/IP applies the Common Industrial Protocol (CIP) over TCP/IP, and is most often used to integrate Rockwell PLCs. Other Industrial Ethernet protocols are available for specific applications, including FOUNDATION Fieldbus High Speed Ethernet (HSE) for process control. Note: Industrial Ethernet is always installed physically and electrically separate from the DeltaV Ethernet based Area Control Network (ACN). To bring Industrial Ethernet into the DeltaV system, a Virtual I/O Module (VIM) Gateway is installed in either simplex or redundant configuration. This technology is flexible, easy to implement, and allows high speed signaling between PLC controller(s) and a DeltaV controller backplane. A VIM Gateway provides tight integration, keeps the PLC in operation and makes available new operational capabilities such as the following: DeltaV system role Advanced Control Advanced Batch Supervisory Operations Regulatory Control DeltaV Device Workstation or Controller PLC CPU Role
Controller
You may combine these DeltaV applications. Another option is to expand DeltaV control functions and utilize any spare PLC I/O capacity. Over 300 VIM implementations are installed and performing well.
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The VIM supports 128 datasets, 100 registers per dataset. Scan rate is 100 ms for 16 datasets and 32 IP userconfigurable addresses. An Ethernet interface card fits into the DeltaV rack as does a DeltaV serial interface card, and emulates up to four serial cards. VIM architecture is shown in Figures 3 and 4.
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OPC connectivity offers speed, seamless integration with Microsoft and other OLE compliant applications, reduced integration costs because proprietary drivers need not be created, and the ability to talk to a wide range of equipment and devices for which OPC servers have been written. OPC integration keeps your PLC in operation and supports operations including the following: DeltaV system role Advanced Control Advanced Batch Supervisory Operations DeltaV Device Workstation or Controller Workstation PLC CPU Role
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Next is a discussion of how these protocols enable you to keep some PLC based system components in service, while modernizing others as you move automation functions into a DeltaV system.
Migration Options
Visualize a migration continuum, beginning with a standalone PLC based system, with no ties to another process automation platform. The end point has no PLC; functions formerly performed by the PLC are implemented in a DeltaV system. The DeltaV system shares process and equipment data with business and maintenance systems for predictive diagnostics, quality assurance, and resource management. In determining the best route for your system migration, consider these intermediate phases, shown in Figure 6, which allow you to extend useful service of some PLC components during modernization.
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PLC PLC-5 PLC-3 SLC505 RSLogix Modicon Quantum Modicon 984 Series 90-30 S5, TI500, TI505 S7
Networks
1- If previous MMI used a different network, such as RSLinx, code changes may be required 2-NonIntelligent Terminal Protocol (NITP)
Application Code Changes Map I/O to I, O, and N-tables Map I/O to I, O, and N-tables or ENBT slots
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PLC IO Interface PLC IO Interface for 1771 Remote I/O1 FlexIO with Ethernet/IP or DeviceNet PLC IO Interface for S908 Remote I/O1 or Modbus/TCP PLC IO Interface for S908 Remote IO1 (for 800 Series I/O only)
PROFIBUS DP and DeviceNet I/O PLC I/O modules can directly integrate into a DeltaV controller, using native DeltaV PROFIBUS DP or DeviceNet I/O cards. PROFIBUS hardware and configuration software are available for TI 500 and TI 505 I/O, ABB S800 I/O and Siemens ET200 I/O. Similarly, a DeviceNet interface is available for Rockwell FlexIO. Emerson Process Management offers Proof of Solution services to reduce risks associated with standard digital bus device integration. This service includes analysis of all communication parameters and signal diagnostics. PLC IO Interface The PLC IO interface is based on the proprietary protocol of several common installed older PLC I/O systems. The solution leaves in place the PLC I/O and communicates via remote I/O communication protocol using the PLC IO interface. PLC I/O to DeltaV controller communications utilize Modbus/TCP and a VIM, which communicates with up to four PLC IO interfaces. VIM modules and PLC IO interfaces can be redundant. Simplex I/O interface architecture is shown in Figure 7.
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PLC IO interface specifications: Allen-Bradley 1771 Remote IO Interface o o o o Supports diagnostic functions for 1771 Remote I/O Modules each support up to 32 remote I/O racks Functions as a remote I/O master/scanner Is applicable for Allen-Bradley PLC5 and PLC3
Modicon S908 Remote IO Interface o o Supports 800-Series and Quantum I/O Supports device diagnostic information, housekeeping tasks of initialization and fault management Modules each support up to 32 remote I/O drops 800-Series I/O Each drop has five 16-slot racks Quantum I/O Each drop has four 16-slot racks o Is applicable for Modicon PLCs and Novatech (formerly GSE) D3 systems
DeltaV Whitepaper
March, 2012 Page 12 GE Genius IO Bus o o Functions as Genius I/O Bus Controller Supports device diagnostic information, housekeeping tasks of initialization and fault management Supports 31 nodes of I/O blocks and bus controllers including Genius blocks, Field Control I/O Stations, and Series 90-70 Remote I/O Scanner Is applicable for GE PLCs and ABB MOD300 (TRIO I/O)
Transition Services
Database Conversion
Transferring PLC I/O and control configuration data to a DeltaV system requires careful oversight by engineers who understand both systems. Emerson Process Management migration teams: Are well versed in control database, logic, and special applications. Understand configuration and programming in DeltaV systems and PLC based systems. Provide design services.
Display Conversion
Recreating PLC displays to have a familiar look and feel on the new DeltaV system is one way to smooth the learning curve for operations personnel. However, developing new displays may be more advantageous, as this presents an opportunity to incorporate advanced graphic technologies with graphic standards and operating philosophies pertinent to this application, industry, and site. Whether using new designs or following the original display layout, PLC style faceplates may easily be implemented and can accelerate operator learning.
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Managing Risk
Emerson Process Management and its alliance partners have an excellent track record of helping clients improve business results through modernization. Emerson engineers and project managers have implemented efficient system configuration, successful hot cutovers, site checkouts and system startups during tight turnaround periods. Through these experiences, Emerson has developed a suite of tools and services to ensure success in control system transitions. With these tools and services, Emerson project teams effectively address and contain risks associated with each stage of the project to meet budget and schedule requirements. Method and scope of project will vary, based on factors such as: legacy PLC type, database size, modernization objectives and strategy, resource availability, budget and schedule constraints. Common milestones in successful modernization projects include: Site Assessment and Modernization Study. A modernization study delivers a report of business benefits, including Return On Investment (ROI) made possible through process optimization, or other technology enabled techniques for improved efficiencies or reduced variability. Front End Engineering Design (FEED) study. The FEED delivers essential plans that significantly reduce risks of downstream implementation delays and cost increases. Design and Implementation. As mentioned above, modernization is most efficiently accomplished by engineers who know the older system, as well as the newer. Emerson offers such expertise for PLC migration to the DeltaV system. Factory Acceptance Test (FAT). The FAT confirms new system control and operate functions are aligned with documented requirements. MiMiC , an I/O simulation application allows testers to manipulate I/O, accelerates testing and gives added confidence in the DeltaV configuration. Effective Training ensures rapid adoption of newer technologies. Once DeltaV database and graphics are built and tested, operator training tools are available on the new system. DeltaV Simulate Pro generates realistic field responses to operator actions without connecting to hardware I/O. In a safe and virtually risk-free environment, operators can practice running a familiar process from new DeltaV workstations. Also, Emerson customizes training solutions to meet site specific needs. Custom and standard coursers are available at your site or in an Emerson training center. For more information about these effective training options, please visit DeltaV Operator Training Solutions at http://www2.emersonprocess.com/en-US/brands/edservices/deltavots/Pages/DeltaVOTS.aspx .
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Summary
Emerson personnel are at your service, to assist with evaluating, justifying, planning and implementing your PLC modernization. By applying field tested and proven interfaces, you can keep viable components of the legacy PLC system in place while expanding data integration capabilities and improving operational efficiencies. Teaming with Emerson lowers risks associated with project execution, personnel training, commissioning and startup. These principles are depicted in Figure 8.
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www.EmersonProcess.com/DeltaV