Chapter 11
90
Maintenance
11.2 Device
replacement
A critical fault in a MELSEC-WS module impairs the complete network. Devices that
have critical faults must therefore be repaired or replaced rapidly. We recommend
keeping spare devices of the MELSEC-WS modules at hand so that network
operation can be re-established as fast as possible.
Safety measures for replacing devices
Observe the following safety measures when replacing MELSEC-WS modules:
Do not try to dismantle or repair the MELSEC-WS modules. Not only does
Mitsubishi accept no claims for liability, but it is also dangerous as it makes
verifying the original safety functions impossible.
Reset the device into a state in which safety is ensured.
Carry out replacement only when the voltage supply is switched off in order to
avoid an electric shock or unexpected device behavior.
In order to continue using the system configuration check:
– Is the new module of the same type (same material number) and is there no
error at the new module after the replacement?
– Is the new module plugged in at the same position as the replaced module?
– Have all connectors been re-connected to the correct terminals?
Otherwise you have to completely reconfigure and commission the new system,
including all the necessary tests (see Chapter 9).
After the replacement ensure that no errors arise with the new MELSEC-WS
modules.
Always carry out a function test before commissioning a replacement module.
SICK EFI-compatible devices do not have to be reconfigured after the
replacement of a MELSEC-WS module.
If you send in MELSEC-WS modules for repair, generate a report on your project
and carry out diagnostics with the Setting and Monitoring Tool, enclose a detailed
description of the problem with the device and send the MELSEC-WS modules
with all available information to your local Mitsubishi representative.
Note
Содержание MELSEC-WS series
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