INM 9370-RD Rev 5
23
Temperature transducer
Block
Temperature
(TT)
Alarm module internal temperature (same
measurement as in the Resource block)
Extended diagnostics
transducer Block
Diagnosis
(TED)
Not used, but note that this block drives DI1
and DI2
HMI transducer Block
(LCD)
HMI (THMI)
Not used
When supplied as part of a 9372-FB Redundant Fieldbus Barrier or separately as
an 9379-ALM alarm module, the device’s alarm thresholds are pre-configured to
correspond to the output signals of the MTL Fieldbus Barrier modules. Further device
configuration is not necessary. The default tag names for each function block are
identified in the above table, but maybe user-configured. Function blocks indicated as
‘not used’ can be ignored.
The block types of interest in the MTL application are as follows:
7.2.1 Resource Block
The Resource Block contains general information relating to the Alarm module.
Parameters of use in the MTL application are:
•
Bus voltage. This is a measurement of the voltage appearing at the H1
terminals of the alarm module, and is an indication of the health of the
Fieldbus Barrier spur to which the module is connected. This voltage will
have a value in the range 10.0 to 13.0V.
•
Device Temperature. This is the temperature measured inside the alarm
module. Note that this measurement is repeated in the Temperature
Transducer Block.
•
SW version. Firmware version of the alarm module.
•
FW version. Hardware version of the alarm module.
7.2.2 DI (digital input) Function Blocks: failure alarm status of 9377-FB-R
barrier modules
The two discrete input blocks conform to FF standard FF-891 and are used by
the alarm module 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:
DI (digital input) Block 1:
PV_D value = 0: 9377-FB-R Barrier Module A healthy
PV_D value = 1: 9377-FB-R Barrier module A one or more spurs failed
DI (digital input) Block 2:
PV_D value = 0: 9377-FB-R Barrier Module B healthy
PV_D value = 1: 9377-FB-R Barrier module B one or more spurs failed
7.2.3 DI (AI (analog input) Function Blocks: spur short-to shield detection
AI blocks 2 and 3 include pre-configured Discrete Output values that indicate
the presence of a spur short-to-shield fault, as follows. Note that although the
blocks are identified as Analog Input blocks, they each contain a binary ‘OUT_D’
value. The primary analog ‘OUT’ values should be ignored.
AI (analogue input) Block 2:
OUT_D value = 0: 9377-FB-R Barrier Module A short-to-shield OK
OUT_D value = 1: 9377-FB-R Barrier Module A short-to-shield fault detected
AI (analogue input) Block 3:
OUT_D value = 0: 9377-FB-R Barrier Module B short-to-shield OK
OUT_D value = 1: 9377-FB-R Barrier Module B short-to-shield fault detected
