Rockwell Automation T8094 8000 Series TMR System Safety Manual User Manual
Page 117
SAFETY MANUAL
D oc N umber T8094
I ssue 27 – June 2013
Page 96 of 103
9.10.6.13 IPV, input verification
Purpose:
The IPV (input verification) output represents the field input of the channel.
Data type:
Boolean
Direction:
From DIPT to application
Values:
TRUE – input channel (voted) high
FALSE – input channel (voted) low
Notes:
IPV is the voted input state to be used by the application.
9.10.6.14 LF, line fault
Purpose:
The LF (line fault) output is a logical OR of the SC and OC outputs from the
LFLT
Data type:
Boolean
Direction:
From LFLT to application
Values:
TRUE - either SC or OC (or both) is TRUE
FALSE – SC and OC are FALSE
9.10.6.15 MDA / MDB, monitor discrepancy
Purpose:
The MDA and MDB (monitor discrepancy) parameters show when there is a
discrepancy.
Data type:
Boolean
Direction:
From application to RMET
Values:
FALSE – a discrepancy exists between the commanded and actual states of
one of more output channels in a TM117-RME/SME termination module
Otherwise TRUE
Notes:
Connect MDA and MDB to the A and B slices of the TM117-RME/SME
monitored output termination assembly.
9.10.6.16 MTS, manual test start
Purpose:
The MTS (manual test start) input starts a test sequence if there is no test
already in progress.
Data type:
Boolean
Direction:
From application to ITSTM or OTSTM
Values:
TRUE
FALSE
Notes:
Make sure that the application returns MTS to FALSE promptly. This input
parameter is level sensitive, and will cause repetitive testing (and relay chatter)
if it is held TRUE.
9.10.6.17 OC, open circuit
Purpose:
The OC (open circuit) output tells the application when the value of the process
input is less than the OCTHR
Data type:
Boolean
Direction:
From LFLT to application
Values:
TRUE – the process input is less than the OCTHR
Otherwise FALSE
9.10.6.18 OCTHR, open circuit threshold
Purpose:
The OCTHR (open circuit threshold) determines the low (or open circuit)
threshold for the analogue input tested by the LFLT
Data type:
analogue
Direction:
From application to LFLT
Values:
41 to 4,054
9.10.6.19 OPA / OPB, output A / B
Purpose:
The OPA and OPB outputs control each of two TM117-RME/SME monitored
output termination module output slices. OPA and OPB are not for direct use by