三菱 三菱-Serial Communication 模塊 用戶手冊 (硬件)A1SJ71QC24N1,A1SJ71QC24N1-R2.pdf
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>> MelsecNet/Mini模塊
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[DESIGN PRECAUTIONS]
DANGER
z When using the notification function, the pager receiver may not be
contacted due to the frequency transmission status from the system setup
environment and error on the receiver side.
To ensure the safety of the PLC system, install a call circuit with a lamp
display or buzzer sound.
z When performing the control of the PLC in operation (especially changing
data, program, and operation status (remote run/stop)) by connecting a
personal computer, etc. to the special function module, configure an
interlock circuit in a sequence program so the safety of the overall system is
always maintained.
Especially, when this control is performed to a remote PLC from an external
device, troubles that have occurred on the PLC side may not be able to
immediately be handled if there is a data communication error.
Define a troubleshooting agreement between external devices and the PLC
CPU for data communication error occurrences, as well as construct an
interlock circuit in the sequence program.
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