7.5
Adding Safety Node Unit
This chapter explains how to add a safety node unit at the end of the ESB bus.
IMPORTANT
After adding a new safety node unit, offline download is necessary if the version of SCS sys-
tem programs is earlier than R2.03.
When adding 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.
•
Adding safety node unit can be done 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
Adding a Safety Node Unit at the End of ESB Bus
1. Check the Bus1 and Bus2 status on the SCS state management window beforehand.
2. 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.
3. 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. How to separate is illustrated in the figure of "Procedure of Separating ESB bus
branch connector from ESB bus interface module."
ESB bus interface module
(SSB401)
ESB bus branch connector
(ESB bus branch connector with built-in terminator)
ESB bus cable
Figure 7.5-1 Separating ESB Bus Branch Connector from ESB Bus Interface Module
4. Disconnect cable from the ESB bus branch connector (with built-in terminator) that was
separated from the ESB bus interface module (SSB401) on step 3.
5. Connect the cable disconnected on step 4 to an ESB bus branch connector (without built-
in terminator), and then fasten the connector screws for about 0.3 N•m torque.
6. Use an ESB bus cable to connect the ESB bus branch connector (with built-in terminator)
you worked on step 4 and the ESB bus branch connector (without built-in terminator) you
worked on step 5.
<7.5 Adding Safety Node Unit >
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IM 32Q06C10-31E
4th Edition : Jan.30,2015-00
