Instruction manual

19
INM9380-RD-1
May 2012
7.2.1 DI Function Blocks: failure alarm status of 9377-FB-R barrier
modules
The two discrete input blocks conform to FF standard FF891 and are used by the TTH300
for cyclic reading out of extended diagnostics information.
For the MTL redundant Fieldbus Barrier, the output of the blocks indicate the health of the
9377-FB-R barrier modules as follows:
Digital Input (DI) Block 1:
Output false (0): 9377-FB-R Barrier Module A healthy
Output true (1): 9377-FB-R Barrier module A failed
Digital Input (DI) Block 2:
Output false (0): 9377-FB-R Barrier Module B healthy
Output true (1): 9377-FB-R Barrier module B failed
7.2.2 Analog Input (AI) Function Blocks: spur short-to shield detection
There are four AI blocks, of which block 2 and 3 are the Primary Values. Block 1 can
contain a value derived from the values contained in block 1 and 2, and block 4 is
assigned to a Secondary Value.
In use, block 2 and 3 include pre-configured Discrete Output values that indicate the
presence of a spur short-to-shield fault, as follows:
Analog Input (AI) Block 2:
Output false (0): Spurs OK
Output true (1): Short to shield on one or more spurs
Analog Input (AI) Block 3:
Output false (0): Spurs OK
Output true (1): Short to shield on one or more spurs
7.3 Alarm module fitting or replacement
A standard 9387-FB-Px-R assembly is supplied with the Alarm module fitted to Spur 6.
The alarm module, if supplied as a separate item, is ready wired with two connectors, a
(2-wire) blue connector for the fieldbus ‘Spur’ connection and a black (3-wire) connector
for the ‘Alarm’ signals from the barriers.
Figure 7.1 - Alarm module wiring connections