Omron SYSMAC CJ1W-SCU21-V1, Руководство по эксплуатации

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Replacement Precautions Section 11-6
11-6 Replacement Precautions
A malfunction of the Serial Communications Board or Serial Communications
Unit may affect the operation of remote communications devices, so be sure
to perform repairs or replace the faulty Board or Unit promptly. Make sure a
spare Serial Communications Board or Unit is available to replace a faulty
one, so that functionality can be restored without delay.
11-6-1 Precautions when Replacing Board or Unit
Observe the following precautions when replacing the Serial Communications
Board or Serial Communications Unit.
• Always turn OFF the power to the PLC before replacing the Board or Unit.
• Be sure to check that the Board or Unit replacing the faulty one is not
defective.
• If the defective Board or Unit is to be dispatched to the manufacturer for
repair, be sure to include documentation stating the nature of the fault in
as much detail as possible, and send to your nearest OMRON branch or
sales office, listed at the back of this manual.
If the contacts are defective, clean the contacts with a clean all-cotton cloth
moistened with industrial-strength alcohol. Remove any cloth particles before
mounting the Board or Unit.
Note Turn OFF the power to all serial external devices when replacing the Board or
Unit to prevent malfunctions.
11-6-2 Settings after Replacing Board or Unit
After replacing the Serial Communications Board or Serial Communications
Unit, make sure that wiring and settings, such as hardware switch settings,
the Unit/Board Setup, and protocol macro data are the same as the Board or
Unit that was replaced.
Note 1. If the CPU Unit is to be replaced, transfer to the replacement CPU Unit the
contents of the Holding Areas and DM Area required for operating the Unit
before starting operation. If the relationship between the DM Area and
Holding Area and the program is not maintained, unexpected malfunctions
may result.
2. The System Setup of the Serial Communications Board or Unit is saved in
the DM Area of the CPU Unit. If the CPU Unit is to be replaced, either
transfer the System Setup data to the CX-Programmer before replacing
the CPU Unit or reset the System Setup.
11-6-3 Replacing the Board or Unit
Standard System Protocols, Host Link Communications, or 1:N NT Links
1,2,3... 1. Turn OFF the power to the PLC to which the Serial Communications Board
or Unit to be replaced is mounted, and to all serially connected external de-
vices.
2. Disconnect the communications cables connected to the Serial Communi-
cations Board or Unit to be replaced, and also remove the Board or Unit.
3. Set the hardware switches of the replacement Board or Unit to the same
settings of the Board or Unit being replaced before mounting, as follows:
• Unit number setting switch (Serial Communications Units)
• Terminating resistance switch (RS-422A/485 ports)