Omron SYSMAC CS1D-PD Series Operation Manual page 201

Installation
Interlock Circuits
5-2 Installation
5-2-1 Installation and Wiring Precautions
Ambient Conditions
MCB1
MCB2
Note Do not latch the RUN output and use it in a circuit to stop a controlled object.
Chattering of the relay contacts used in the output may cause incorrect opera-
tion.
When the PLC controls an operation such as the clockwise and counterclock-
wise operation of a motor, provide an external interlock such as the one
shown below to prevent both the forward and reverse outputs from turning ON
at the same time.
000501
Output Unit
000502
This circuit prevents outputs MC1 and MC2 from both being ON at the same
time even if both CIO 000501 and CIO 000502 are both ON, so the motor is
protected even if the PLC is programmed improperly or malfunctions.
Be sure to consider the following factors when installing and wiring the PLC to
improve the reliability of the system and make the most of the PLC's func-
tions.
Do not install the PLC in any of the following locations.
Power supply
CR1
Controlled system
Transformer
or noise filter
CS1D PLC
in Duplex Mode
Twisted-pair wires
DC voltage
regulator
PLC RUN
output
Surge suppressor
CR1
Interlock circuit
MC2
MC1 Motor clockwise
MC1
MC2 Motor counterclockwise
Section 5-2
+
DC
input/output
−
161