7.6 Removing Safety Node Unit
This chapter explains how to remove a safety node unit from the end of the ESB bus.
When removing a safety node unit, satisfy the following requirements:
•
Work on one side of the ESB bus first, work on the other side only when the first side is
completed.
• The safety node unit can be replaced while the Safety Control Unit is running
When the SCS is running (online), it is necessary to be very careful to proceed according to
the following procedures.
n
Removing a Safety Node Unit from the End of ESB Bus
1. Check the Bus1 and Bus2 status on the SCS state management window beforehand.
2. Delete (online) all the definitions related to the I/O modules installed in the node to be re-
moved. This will also delete the definition of the node.
3. Disconnect the cables of the I/O modules installed in the node, or remove the terminal
blocks.
4. Loosen the two mounting screws in the upper and lower parts of the I/O module.
5. Pull the I/O module forward and remove it from the base unit.
6. Repeat step 3 to step 5 to remove all the I/O modules from the node.
7. Turn off the power supply to the node to be removed.
8. Work on Bus 1 of the safety control unit; pull the ESB bus coupler module (SEC402/
SEC401) forward and remove it from the base unit. ESB Bus1 will then be indicated as
FAIL. At this moment, make sure that Bus 2 is normal.
9. Find the last node of Bus 1, and then separate the ESB bus branch connector (with built-
in terminator) from the ESB bus interface module (SSB401) without disconnecting the ca-
ble.
10. Find the new last node of Bus 1, and then separate the ESB bus branch connector (with-
out built-in terminator) from the ESB bus interface module (SSB401) without disconnect-
ing the cable.
11. Disconnect cable from the ESB bus branch connector (with built-in terminator) that was
separated from the ESB bus interface module (SSB401) on step 9.
12. Disconnect the cable that is attached to the other end of the ESB bus branch connector
(without built-in terminator) that was separated from the ESB bus interface module
(SSB401) on step 10.
13. Connect the cable that was disconnected on step 12 to an ESB bus branch connector
(with built-in terminator), and then fasten the connector screws for about 0.3 N•m torque.
14. Connect the ESB bus branch connector (the same one mentioned in step 13) to the ESB
bus interface module (SSB401) on the new last node and this node becomes the end of
the bus.
15. Put back the ESB bus coupler module (SEC402/SEC401) to the base unit where you re-
moved it from on step 8.
16. On the SCS State Management window, make sure that no abnormality occurs on the
ESB bus.
17. Repeat step 9 to 14 to work on Bus 2 of the ESB bus.
18. On the SCS State Management window, make sure that no abnormality occurs on either
Bus 1 or Bus 2.
<7.6 Removing Safety Node Unit > 7-30
IM 32Q06C10-31E 4th Edition : Jan.30,2015-00
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