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5 SETTINGS AND PROCEDURES BEFORE SYSTEM OPERATION
5.7.2 Wiring precautions
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As one of the requirements to give full play to QJ71PB93D's functions and make up
the system with high reliability, it is necessary to have an external wiring unsusceptible
to an influence of noise. Precautions against external wiring of QJ71PB93D are
described below.
(1) Communication cable wiring
Do not install the QJ71PB93D communication cable together with the main
circuit, power lines and/or load carrying wires for other than the programmable
controller, or bring them close.
Doing so may cause the QJ71PB93D to be affected by noise and surge
induction.
(2) Wiring from I/O modules among programmable controllers
Keep the PROFIBUS cable away from I/O module cables as much as possible.
Shield jacket
(3) Grounding
(a)
When using the QJ71PB93D, basically ground the FG and LG terminals of
the power supply module of the programmable controller.
(b)
Grounding the module and other device with the same FG terminal may
apply noise through the FG terminal and result in a communication error. If
this error occurs, disconnect the FG terminal from the module.
Wiring of input module
Wiring of output module
MELSEC-Q
Input module
Output module
QJ71PB93D
PROFIBUS cable
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