Wiring The Remote I/O Cable; Wiring I/O Modules - Hitachi HSC-2100 Hardware Manual

4 WIRING

4.4 Wiring the Remote I/O Cable

For information on how to wire the remote I/O cable to the LPU or CPU unit, refer to the
instruction manual on the LPU or CPU.

4.5 Wiring I/O Modules

When wiring an I/O module, satisfy the following requirements:
In any case where it is possible, the I/O cable to the I/O module should be set at least 10 cm
apart from any AC power cable.
If the I/O cable to the I/O module is long and it is unavoidable to lay part of the I/O cable in
parallel with an AC power cable without satisfying the above requirement, use a multi-
conductor shielded cable as the I/O cable and ground the shield wire of the cable.
If the I/O cable to the I/O module is laid in a duct or conduit, be sure to ground the duct or
conduit.
When wiring the I/O cable to a terminal block, be sure to use solderless terminals.
In addition to the above requirements, the following additional requirements must also be
satisfied because analog I/O modules process low-level analog signals.
The I/O cables transferring analog signals may be tied together, but they may NEVER by tied
together along with I/O cables carrying digital signals. The analog signal cables must be
separated from the digital signal cables.
When mounting an analog I/O module in a mount unit, take into consideration the easiness of
separating the analog module from alternating digital signals. Such easiness can be realized
by mounting only analog modules either in slots close to the station module or in the last
(rightmost) and preceding slots, without leaving any empty slots in between.
The cable used for an analog module must be a shielded twisted-pair cable.
If the cable used for an analog module receives a significant influence from noise, its shield
should be grounded at the cable entry of the cubicle and its length should be made as short as
possible.
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