PID Controlling by CM30
i want to use CM30 controller to control PID loops ( 2 PID loops on each CM30 )
i will use about number 10 CM30 controllers so i need to communicate all CM30 by ethernet with scada !
what if i don't need plc !! can the scada communicate with the CM30 without plc so how can i do this and what is the software .
what if i need plc to programming small program concerning the PID loops ! what is the best plc that i must use it and the scada and connect them also with CM30
for cm30 what is the difference between standard and optional
how can i do the process by using CM30 ? is cm30 enough to do pid loops
what then if i will need some programming besides pid controlling can i make these without using plc !
automation & Control Engineer
Voted best answer
Control Master communicates via Modbus with a PLC/DCS or Scada system. It supports RS485 serial bus, or Modbus TCP (Ethernet).
For Freelance you would need a process station like AC 700F, AC 800F or the upcomming AC 900F to talk to the CM. DigiVis itself does not talk Modbus.
Below is an example how to connect a CM to Freelance, which was created by Sumit.
He uses the CM50 as a backup controller for loops in the AC700F.
I don't know which Freelance version the project file was created with and if you use an older Freelance version you will not be able to import it, but you can at least have a look at the word file describing what he did.
Without a process station you would need an OPC server that talks Modbus to the CM30s, maybe from Matricon? Then you can use the PLC integration function of DigiVis to create OPC tags with Faceplates and Free Graphics for the Loops in the CM without a process station.
try to check next link - there is possible to find answers to your topics:
1. If you don't need a PLC then, you can either use Panel800 (this is a panel mount HMI) to communicate with all 10 nos. CM30's via MODBUS TCP/IP or MODBUS RTU else you can use Compact HMI 800 scada to communicate the same via MODBUS TCP/IP.
2. If you need a PLC then, you can use AC500 PLC's to do simple control logic programming and on top use Compact HMI 800 as scada. AC500 PLC can talk to CM30 via MODBUS TCP/IP and Codesys OPC server can be used to communicate AC500 with Compact HMI.
for your solutions , best way to use the scada package which will directly communicates with CM30 on modbus . As per my knowledge Ellipse E3 and also ABB CHMI ( controller driver modbus ) will be the bset option . If you need any failsafe changeover to stnadby to controller CM30 you need PLC .