Cyclic Data Is 0 Caused By Reset Or Power-On Of Each Station - Mitsubishi Electric Melsec QJ71LP21 Reference Manual

8 TROUBLESHOOTING

8.2.4 Cyclic data is 0 caused by reset or power-on of each station

Check item
Is the send range latched?
Is the block data assurance per station of the cyclic data set? Check whether block send data assurance per station is set.
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POINT
A network module may send the initial value 0 in LB/LW data even B/W device in
the send range of CPU parameter is latched.
By setting the block send data assurance per station prevents cyclic data from
being 0 since LB/LW data is sent after link refresh.
Check whether B/W device in the send range is latched by latch setting of the
CPU parameter.
MELSEC-Q
Checking procedure
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