Instruction manual
13
INM9380-RD-1
May 2012
a) Engage the locating guides (A) of the 9377-FB-R Fieldbus Barrier module into the
sockets provided on the carrier and push the module fully into place.
b) Tighten the three captive fixing screws (C & D) to a recommended torque of 0.9Nm
to secure it.
A
B
D
C
C
Fail-over
button
AB
Figure 5.1 - Fieldbus Barrier module – fitting & removal
5.2.2 Use of Fail-over button when replacing a barrier
Although direct removal of the “active” barrier of a redundant pair will cause all spurs
to be redirected automatically to the “standby” barrier, the following technique is
recommended for the replacement of a barrier.
Two fail-over buttons are provided on the module carrier to permit a manual transfer of
spur control from one barrier module to another - A
>
B or B
>
A. These are used during
module replacement to ensure that all spurs remain powered. The following four-step
example illustrates a typical “hot-swap” procedure.
1 2 3 4 5 6
Barrier A
Acve
1 2 3 4 5 6
Barrier B
Standby
Situaon 1
1. Spur 3 on Barrier A has failed and shows red. Control of this spur has transferred
automatically to Spur 3 of Barrier B, which now shows a solid, not flashing, green.
Barrier A should therefore be replaced to ensure continued redundant service.
1 2 3 4 5 6
Barrier A
Standby
1 2 3 4 5 6
Barrier B
Acve
Situaon 2
2. Pressing the A
>
B fail-over button beside Barrier A, passes all spur control to Barrier B.
All spur LEDs on Barrier A now flash, while those on Barrier B are solid green; this
indicates that Barrier A is now in “standby” and Barrier B is “active”.
3. Barrier A can now be removed from the carrier (following the procedure in Section 5.2.1.1
on page 12) and replaced with a known good module. On replacement, Barrier A
remains in “standby”.
= Acve, healthy
= Failed
= Standby, healthy
= Standby, Failed