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MELSEC-Q
17 COMMUNICATIONS BETWEEN THE MULTIPLE PLC SYSTEM'S I/O
MODULES AND INTELLIGENT FUNCTION MODULES
17 COMMUNICATIONS BETWEEN THE MULTIPLE PLC SYSTEM'S I/O
MODULES AND INTELLIGENT FUNCTION MODULES
17.1 Range of Control PLC Communications
The relationship between control PLCs and control modules (I/O modules, intelligent
function modules, special function modules) is the same as with independent CPU
systems.
There is no restriction to control the control module with the control PLC.
17.2 Range of Non-control PLC Communications
It is possible for non-control PLCs to read the contents of the intelligent function
module's buffer memory.
It is also possible to load non-control module input (X) ON/OFF data and another PLC
module output (Y) ON/OFF data with the PLC parameters.
Input modules controlled by other PLCs can be used as interlocks for the host PLC,
and the output status to external equipment being controlled by other PLCs can be
confirmed.
However, it is not possible for non-control PLCs to output ON/OFF data to output
modules or intelligent function modules, or write in the buffer memory of intelligent
function modules.
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