Precautions
xii
Installation Environment
1. Do not install the ZEN in the following locations.
• Locations subject to radical changes in temperature
• Location with high humidity subject to condensation
• Locations subject to excessive dust or dirt
• Locations subject to corrosive gas
• Locations subject to direct sunlight
2. Do not install the ZEN in locations subject to shock or vibration. Extended use in such location may cause
damage from stress.
3. In environments subject to static electricity (e.g., close to pipes conveying forming materials, powders, or fluid
materials), separate the ZEN as far as possible from the source of static electricity.
4. The ZEN is neither waterproof nor oil-proof. Do not use it in locations subject to water or oil.
5. Use the ZEN within the allowable power supply voltage range. Be particularly careful in locations with bad power
supply conditions, e.g., large fluctuations in the power supply voltage.
6. Do not install the ZEN in locations subject to excessive noise, which may cause the ZEN to fail.
7. Take appropriate and sufficient countermeasures when installing systems in the following locations:
• Locations subject to strong electromagnetic fields
• Locations subject to possible exposure to radioactivity
Power Supply
1. Always turn OFF the power supply to the ZEN (CPU Unit and Expansion I/O Units) before attempting any of the
following.
• Assembling the ZEN
• Attaching or removing Expansion I/O Units
• Connecting or disconnecting any cables or wiring
• Attaching or removing the Memory Cassette
• Attaching or removing the Battery Unit
2. If the power supply is interrupted for 2 days or more (at 25°C), the internal capacitor will discharge and internal
bit status and the contents of PV areas will be lost or corrupted and dates and times will be reset. When
restarting operation after the power supply has been interrupted for an extended period of time, check the
system in advance to confirm that no errors will occur.
Handling
1. Connect connectors only after confirming that the direction or polarity is correct.
2. Failures could result if dust or dirt enters the ZEN. Always connect the connector cover to the computer
connector whenever it is not being used.
3. Do not remove the label from the left side of the CPU Unit if a Battery Unit is not mounted.
EEPROM Write Life
The EEPROM has a limited write life. The write life may be exceeded if communications are used frequently to
write settings. Consider this in the system design.
Other
1. The execution of the ladder program in the ZEN is different from that for other PLCs. Refer to Appendix B Ladder
Program Execution in the ZEN Programmable Relay Operation Manual (Cat. No. Z211) when writing the ladder
program.
2. Abide by all local ordinances and regulations when disposing of the ZEN.
3. The Battery Unit (ZEN-BAT01, sold separately) contains a lithium battery. Observe all applicable legal
requirements for your area when disposing of the lithium battery.
Precautions for Correct Use
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