Chapter 2: Modbus PLCs Using Modbus
23
Modicon 584, 884, and 984 Register, Input and Coil References
The Modicon PLCs listed above use decimal word addresses. The Operator Station format default is
BIN4. The following list contains the supported memory types.
0XXXX
Coils/discrete
outputs
0XXXXX
1XXXX
Discrete inputs (read only)
1XXXXX
3XXXX
Input registers (read only)
3XXXXX
4XXXX
Holding/output registers
4XXXXX
Note:
The Modicon PLC model 984-785 allows six-digit addressing and holding/output register bit
writes.
Note:
Individual bit writes to the holding/output register are not allowed (except for the 984-785
PLC).
The following is the format for a register reference.
[rr]
rr
PLC reference number of the register.
The following is the format for an input reference.
[ii]
ii
PLC reference number for an input.
The following is the format for a coil reference.
[cc]
cc
PLC reference number for a coil.
Summary of Contents for Cutler-Hammer PanelMate Modicon
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