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Network Inputs are numbered 1 - 16. Bits in the corresponding PLC word are typically numbered 0

- 15. A Modicon PLC will use bit 16 – 1.

It is possible to have a physical input wrapped around to an network output (for monitoring

purposes) by first map the input to an 'Available I/O' point, and then map the same Available I/O

point to a network output.

In this example, we want logical I/O points that can cause a Warning or Fault visible in the

Network Outputs register (CIT Word 17), along with the logical outputs Ready, Running and

Good Feedrate. We only control one input, Run Permission.

This is how the digital inputs were mapped in the GCM for this example:

Logical

Physical

Warning/Fault

Word:Bit in the CIT

Run Permission

Network Input 1

45:0 to GCM

Feeder Block

GCM Input 1

41:8 from GCM

Belt Drv Ovld

GCM Input 2

Warning

41:9 from GCM

Belt Drive Fail

GCM Input 3

Fault

41:10 from GCM

Digital output mapping:

Physical

Logical

Warning/Fault

Word:Bit in the CIT

GCM Output 1

Fdr Drv Enable

42:8 from GCM

External Output 1

Fault

17:0 from GCM

External Output 2

Warning

17:1 from GCM

External Output 3

Ready

17:2 from GCM

External Output 4

Hi Belt Load

Warning

17:3 from GCM

External Output 5

LoadCell 1 Ovl

Fault

17:4 from GCM

External Output 6

LoadCell 1 Undl

Fault

17:5 from GCM

Setting Up the Setpoint Source

The GCM Setpoint Source must be set to Network (Serial): Advanced Setup, Feeder Control,

Source. The setpoint is taken from CIT word 46 and 47.

Connect the Host or Interface to the GCM and Check Communications

Use a cable designed for RS-422. There should be two pairs, individually shielded, with a

characteristic impedance of around 150Ω. Belden 9368 or equivalent is a good alternative. Add

121Ω terminating resistors at both ends of the RS485 line. Connect one between Rx+ and Rx-

and one between terminals Tx+ and TX- at each end of the cable for a total of four resistors. The

pin numbering on the GCM is left to right as you look at the serial connector. See the picture on

the next page. The GCM receives data on terminals 6 and 7 (Rx+ and Rx-), and transmits, after

being correctly addressed, on terminals 8 and 9 (Tx+ and Tx-).

Pair

Part

GCM Terminal

RS-422 Name

Shield

Rx+

Rx-

Tx+

Tx-

The RS485 interface allows for up to 50V common mode swing with respect to the 24V DC

negative terminal on the GCM.

1 2 3 4 5 6 7 8 9 10 11

Transmit 7

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