Posted ByLeon on September 21, 2001 at 15:23:28:
In Reply to: Serial communication capability posted byp.v.visveswaran. on September 21, 2001 at 15:19:38:
1. plc has to communicate with third party equipment through RS232 (2 device with defferent communcation > protocol) in you ladder programming software no option is avilable for serial port protocal development.
Ans: Contrary to what you said, the M-series PLC is extremely capable of communicating with other serial devices.
You construct custom function using TBASIC which handles serial communication extremely well using the INPUT$(n), INCOMM, PRINT #n, OUTCOMM etc. It even communicate with MODBUS device with built in commands READMODBUS and WRITEMODBUS. Please refer to the TBASIC language reference for details.
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2. Any product is avilable to interface with your LCD port for (MMI module 4*20 charter display, 12
fuctional key, 0-9 key and navication keys)
Any MMI that supports MODBUS can be used. We already have built-in 4x20 LCD port. Keypad can be connected to the digital I/Os if need be.
Examples are MMI sucha s Maple Systems and SCADA such as Lookout by National Instrument works well with our PLC.