9-3
Section
Maintenance
165
9-3-3 Replacing Units
The PROFIBUS-DP Master Unit and Slave Units make up the network. The
entire network is affected when a Unit is faulty, so a faulty Unit must be repaired
or replaced quickly. We recommend having spare Units available to restore
network operation as quickly as possible.
Observe the following precautions when replacing a faulty Unit.
•
After replacement make sure that there are no errors with the new Unit.
•
When a Unit is being returned for repair, attach a sheet of paper detailing the
problem and return the Unit to your OMRON dealer.
•
If there is a faulty contact, try wiping the contact with a clean, lint-free cloth
dampened with alcohol.
Note
To prevent electric shock when replacing a Unit, be sure to turn OFF the power
supplies to all of the nodes (Master and Slaves) before removing the faulty Unit.
After replacing a Unit, set the new Unit’s switches to the same settings that were
on the old Unit.
With the Relay Output Unit (GT1-ROP08, GT1-ROS16), malfunctioning Relays
can be replaced.
The following Relays can be replaced:
GT1-ROP08:
G2R-1-SN Power Relay
GT1-ROS16:
G6D-1A Miniature Relay
Use the following procedure to replace Relays. Here, the GT1-ROS16 is used as
an example. The same general procedure applies to the GT1-ROP08.
Note
Check that the internal power supply for the Relay Output Unit, and the power
supplies for the I/O and I/O Interface Units are all OFF before performing Relay
replacement.
1, 2, 3...
1. Push the lever for the Relay to be replaced and remove the Relay. The
Relays are arranged in order, with the corresponding contact numbers
increasing from left to right. Push the lever gently so that the detached Relay
does not spring out suddenly.
2. Insert the new Relay, pushing it into the slot as far as possible. Check the
positioning of the pin in the Relay with respect to the Relay Output Unit, and
be careful to replace the Relay with the correct orientation. When replacing
the Relay, try to keep it as parallel as possible to the plane of the Unit. When
inserting the Relay, push it gently and check whether the Relay is inside the
slot. If the Relay does not enter the slot properly when pushed gently, it
means that the pin is not aligned properly. In this case, remove the Relay
Precautions
Resetting after Replacing
Units
Replacing Relays for the
Relay Output Unit