
5. PROCEDURES BEFORE SYSTEM OPERATION
MELSEC-A
5-9
(3)
Grounding
(a)
When using the AJ71PB92D/A1SJ71PB92D, ground the FG and LG terminals of the power
supply module of the PLC.
(b)
If communication cannot be performed after grounding because of abnormal voltage applied
to the FG terminal, the module may be used without grounding.
(4)
When the AJ71PB92D/A1SJ71PB92D's BUS TERMINATION SWITCH is set to on (has
terminal resistor), do not remove the PROFIBUS cable from the AJ71PB92D/A1SJ71PB92D
during PROFIBUS-DP network operation. If the cable is removed, then the terminal resistor
in the network will disappear, causing an error and bringing down the network.