9-55
9 Troubleshooting and Maintenance
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
9-7 Rep
lacem
ent Pr
ec
auti
ons
9
9-7-1 Precautions when Re
placing Unit
9-7
Replacement Precautions
A malfunction of the Serial Communications Unit may affect the operation of remote communications
devices, so be sure to perform repairs or replace the faulty Unit promptly. Prepare a spare Serial Com-
munications Unit to replace a faulty one, so that you can restore functionality without delay.
Observe the following precautions when you replace the Serial Communications Unit.
•
Always turn OFF the power to the controller before you replace the Unit.
•
Be sure to check that the replacement Unit is not defective.
•
If the defective Unit is to be dispatched to the manufacturer for repair, be sure to include documenta-
tion that states the nature of the fault in as much detail as possible, and send this to your nearest
OMRON branch or sales office.
If the contacts are defective, clean the contacts with a clean all-cotton cloth moistened with industrial-
strength alcohol. Remove any cloth particles before you mount the Unit.
Precautions for Correct Use
Precautions for Correct Use
Turn OFF the power to all serial external devices when you replace the Unit to prevent malfunc-
tions.
After you replace the Serial Communications Unit, make sure that wiring and settings, such as hard-
ware switch settings, the system settings, and protocol macro data are the same as the Unit that was
replaced.
Precautions for Safe Use
•
If the CPU Unit is to be replaced, transfer the data before you replace the Unit by using Sys-
mac Studio and start operation. If the relationship between the program and the status of vari-
ables with retained attributes is not maintained, unexpected malfunctions may result.
•
The System Settings of the Serial Communications Unit are saved in device variables for CJ-
series Unit of the CPU Unit. If the CPU Unit is to be replaced, either transfer the System Set-
tings data before you replace the CPU Unit by using the Sysmac Studio or reset the System
Settings.
9-7-1
Precautions when Replacing Unit
9-7-2
Settings after Replacing Unit
Содержание CJ1W-SCU22
Страница 192: ...4 Using Protocol Macros 4 56 CJ series Serial Communications Units Operation Manual for NJ series CPU Unit W494...
Страница 250: ...6 No protocol Mode 6 22 CJ series Serial Communications Units Operation Manual for NJ series CPU Unit W494...
Страница 460: ...A Standard System Protocol R 126 CJ series Serial Communications Units Operation Manual for NJ series CPU Unit W494...
Страница 473: ...Index 1 CJ series Serial Communications Units Operation Manual for NJ series CPU Unit W494 I Index...