Help me read input PLC, Citect,

ngovankhoi

Member
N
Join Date
Sep 2006
Location
Vung Tau
Posts
6
My PLC is PLC5/40 Enhanced. It has chassis 1771-A3B.
Slot 0: MCM 3100
Slot 1: empty
Slot 2: 1771-IBD
Slot 3: 1771-OBD
Slot 4: 1771-IFE/C
Slot 5: 1771-OFE2/B
My PC is installed Citect 6.
PC Citect 6 is master. PLC5/ 40 is slave.
PC communicates PLC 5/40 with Modbus.
The job is read input and output's status.
Please help me program for PLC 5/40, and communication with Citect.
Thank you!
 
The PLC5 enhanced do not support Modbus protocol on its serial port (channel 0). The normally used protocol on Ch0 is DF1 full duplex.
Maybe Citect supports DF1 natively.
 
I missed that there was a MCM module in slot 0.

Anyway, I find this configuration a bit odd as the PLC has a serial DF1 port already, and Citect supports DF1 natively. So this is the easiest and least troublesome way to let these two talk to each other.

Apart from that, I have no experience with the MCM 3100 module. Sorry about adding to the confusion.
 
Thank,
Now i get stuck in how program for plc to:
PC request PLC-slave
PLC-Slave send status input, output to MCM
(I will use citect read this data on MCM)
 
Thank Praveen Kumar for support
I read MCM5EX1S.
Please help me how to copy status of Input and output to MCM memory?
How to Configure Slave address is 10 (for example).
Because from PC, i will use modbus protocal to ask:
Slave address: is it right?
and then get data PLC on MCM memory by modbus
 
Now, I am successful. I have to modify the program sample of Prosoft for MCM 3100 to get information of input and output. Now, I want to display status of input and output on Citect by connecting Citect with MCM 3100.
Now i do not configure communication to connect Citect and MCM 3100.
Please help me!
I hope your reply soon!
Thank you!
 
If Citect can aleady get info from the PLC then, create Citect tags to get the information from the PLC Data tables where the MCM code is placing the data. Using the current i/o device.
 
The problem is I have to connect with MCM 3100 Modbus
Now, I am successful in connect with Modbus.
And DH+, I do it well.
Thank DungBT
 

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