Eaton Cutler-Hammer PanelMate Modicon, Manual

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Chapter 3: Modicon PLCs Using Modibus Plus
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Introduction
An Operator Station, with an optional Modbus Plus interface board, can communicate with Modicon
controllers that have Modbus Plus compatibility. The Operator Station appears as a node on the
Modbus Plus network (similar to an SA85 network adapter). The interface board has responsibility for
establishing and maintaining communications across the network. No ladder logic is required to
support the interface.
Memory
The following memory types are supported by the Modbus Plus interface board:
XXXX Coils/discrete outputs
XXXX Discrete inputs (read only)
3XXXX Input Registers (read only)
4XXXX Holding/output registers
900XX Global data (read only; range 1-32)
G00XX Global data (Operator Station’s node range; 1-32)
Note: G00XX requires the use of the GLBL prefix.