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selection criteria for plc

Created by: debasish satapathy at: 1/31/2010 7:12 PM (2 Replies)

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1/31/2010 7:12 PM	Rate (0)
debasish satapathy Posts: 23 Rating: (0)	Dear expert, i want to know, what is universal rule for the selection of rack,ps,cpu,sm,im,cp,et.......etc while preparing to set up a new project? thank you. debasish satapathy.
debasish satapathy Posts: 23 Rating: (0)
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1/31/2010 7:35 PM	Rate (0)
Late Platinum Expert Joined: 1/7/2006 Last visit: 11/17/2023 Posts: 2705 Rating: (318)	debasish satapathy Dear expert, Iwant to know, what is universal rule for the selection of rack,ps,cpu,sm,im,cp,et.......etc while preparing to set up a new project? debasish satapathy. Dear Debasish, The rules are most of the time, which I/O and PLC-type is liked by the customer. Another question will be is there much communication, is there a need for Redundancy and/or Safety. For a lot of communication a S7-400 is perfect, for high speed a CPU 319, Redundancy is for the S7-400H and Safety is to split into two different parts, System Safety (most for process) or Distributed Safety (for discrete plant). Further you have to estimate how fast the CPU have to be and if there are other cards that can help you to speedup the process (like a FM or CP). The displays/Scada that are needed and the communication with other parts of the installation have to be considered. And so on, so there is not a golden rule to find out the right CPU for the right job....
	I hope that the answer will help, if you have still questions, don't hesitate to ask me. All the best, Late Never say never, think in solutions, not in trouble......
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2/1/2010 5:26 AM	Rate (1)
how come Posts: 382 Rating: (47)	Dear debasish, I agreed with Late, there is no so call a golden rule to choose the types of CPU,IO,etc. Apart from Late's input, just to add on and share with you usually how I do it:- 1] Theenvironment. e.g roomtemperature or cold environment, for temperature like -25deg,may need to consider siplus item [see this https://www.automation.siemens.com/siplus/html_76/produkte/s7300.htm] 2] The nature of the project. e.g critical process whereby you need to consider failsafe type or hot standby/redunancy system. [see this https://www.sea.siemens.com/us/Products/Automation/Programmable-Controllers/Failsafe_Redundant_PLC/Pages/Failsafe-Redundant-PLC-Distributed-Failsafe-IO.aspx?HTTPS=REDIR] and this [search for S7-400H] 3] Types of communication so as to determine the communication items [e.g OLM, ethernet switches,etc]. Communication can be fiberoptic, profibus, modbus. See these for your references:- SIMATIC NET PROFIBUS Optical Link Module OLM / P11 V4.0 OLM / P12 V4.0 OLM / G11 V4.0 OLM / G12 V4.0 OLM / G12-EEC V4.0 OLM / G11-1300 V4.0 OLM / G12-1300 V4.0 Operation manual SIMATIC S7-300/S7-400 Loadable Driver for Point-to-Point CPs: MODBUS protocol, RTU format, S7 is master SIMATIC S7-300/S7-400 Loadable Driver for Point-to-Point CPs: MODBUS Protocol, RTU format, S7 is Slave Operating Instructions (Compact) SCALANCE W786-1PRO; SCALANCE W786-2PRO; SCALANCE W786-2RR; SCALANCE W786-3PRO 4] Types of field signals to determine the types of IO cards. e.g 4-20mA, digital signals, volts, PT100, etc. SIMATIC S7-300 S7-300 Module data SIMATIC S7-400 S7-400 Automation System Module Data Hope these helps! with regards, how come
how come Posts: 382 Rating: (47)
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