2 SERIAL COMMUNICATION MODULE REPLACEMENT
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2.6.2 Reuse of QnA/QnAS series programs
Data communications between programmable controller CPU and external device, and between
programmable controller CPUs that was performed by the QnA/QnAS series serial communication
module can also be performed using Q series serial communication modules.
The following shows a description of how reuse programs for a QnA/QnAS series serial communication
module for use on a Q series serial communication module at replacement of module.
Item Relevant device Description Remarks
Communication using link
instruction
Programmable
controller CPU
[Data communications by link instructions]
Link instructions are not provided with a function for performing
data communications with another stations programmable
controller CPU on a multidrop connection.
The communications method must be changed (e.g.
communications via MELSECNET/H).
Delete the data communications program using the link
instruction.
Others
Communication
target device
[Data communications on the RS-422/485 interface]
The precautions during data communications are the same as
when a QnA/QnAS series serial communication module is
used.
First check operation of the RS-422/485 interface on the
programmable controller CPU side, and then insert a wait time,
etc. to adjust the data transmission/reception timing.
Refer to the Q Corresponding
Serial Communication Module
User's Manual (Basic).
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