Precautions For Safe Use - Omron ZEN Operation Manual

Please observe the following precautions for safe use of this products.
Circuit Design
1. All interface connectors and battery connector are live parts, they may not be
directly connected to Softy Extra Low Voltage (SELV) circuit or to accessible
conductive parts.
For the programming units and Personal Computers use only the ZEN-CIF01
Connecting Cable (optional accessory) manufactured by OMRON.
ZEN-CIF01 provides safe (reinforced) insulation between Personal Computers
and ZEN.
2. Provide emergency stop circuits, external interlock circuits, limit circuits, and
other safety circuits in addition to any provided within the ZEN control circuits to
ensure safety of the overall system in the event of ZEN failure or external factors.
3. If the ZEN discovers an error during self-diagnosis, operation will be stopped and
all outputs will be turned OFF. As a countermeasure for such problems, external
safety measures must be provided to ensure safety in the overall system.
4. Outputs from the ZEN may remain ON or OFF due to faults in internal circuits
such as output relay fusing or burning, or output transistor destruction. As a
countermeasure for such problems, external safety measures must be provided
to ensure safety in the overall system.
5. Fail-safe measures must be taken by the user to ensure overall system safety in
the event of broken signal lines or momentary power interruptions.
6. The durability of the output relays is largely affected by the switching conditions.
Confirm the operation of the system under actual operating conditions and set
the switching frequency to ensure that adequate performance will be provided.
Insulation faults and burning in the ZEN may result if relays are used after their
performance has deteriorated.
Connecting Expansion I/O Units
1. Supply power to both the CPU Unit and Expansion I/O Units from the same
power supply and turn them ON and OFF at the same time.
2. When connecting Expansion I/O Units with DC inputs to a CPU Unit with an AC
power supply, the burst noise immunity will be 1 kV (IEC 61000-4-4).
3. Expansion I/O Units with AC inputs (ZEN-8E1AR) cannot be connected to a CPU
Unit with a DC power supply.
System Startup and Program Changes
1. Check the user program for proper execution before actually running it on the
Unit.
2. Disconnect the output lines from the system before testing operation in any
system in which incorrect operation can result in injury or equipment damage.
3. Confirm safety before attempting any of the following operations.
• Changing the operating mode (RUN/STOP).
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Precautions for Safe Use

Precautions