Rockwell Automation T8094 8000 Series TMR System Safety Manual - Manual (Page 106)

SAFETY MANUAL
D oc N umber T8094
I ssue 27 – June 2013
Page 85 of 103
• The library reduces application complexity.
9.10.2 Hardware Arrangements
The autotest of the I/O works at the application level and uses dedicated input and
output ports to stimulate and monitor I/O behaviour. The autotest functions work with
the arrangements of additional input and output ports shown in figures C2 thru C5.
These input and output ports are standard I/O, and appear to the application in exactly
the same way as the I/O being tested. The logic convention applied at the application
interface uses logic ‘1’ to show the energised field state.
9.10.3 Quick Reference Guide
There are seven function blocks, these are summarized in Table 20.
Table 20 - Summary of Function Blocks
Term Meaning or origin Remarks
ITSTM input test manager controls the scheduling of diagnostic tests for
digital input modules, including sequencing the
test relays A and B for the termination
assemblies
DIPT digital input (point test) tests digital inputs: decodes the DIM output
from the ITSTM and decides if a fault exists
(one DIPT for each digital input channel)
OTSTM output test manager controls the scheduling and sequencing of
diagnostic tests for digital output modules
RMET RME test tests each of the two slices of a dual digital
output (one RMET for each digital output
module)
LFLT line fault line test looks for failures in field wiring for an analogue
input
PACK16 (†) pack 16 bits packs 16 Boolean variables to one integer
UNPACK16 unpack 16 bits unpacks one integer to 16 Boolean variables
(†) PACK16 has only one output, and is strictly a function, not a function block.
The parameters of the function blocks are summarized in Table 21. Some parameters
are used by more than one function block, for example to send data from one block to
another. Also, many configuration parameters for ITSTM and OTSTM are the same.
Table 21 - Summary of Function Block Parameters
Term Meaning or origin Type Remarks
AB abort test Boolean abort all tests which are running
AMOA all monitors on A Boolean output from termination assembly A to RMET
AMOB all monitors on B Boolean output from termination assembly B to RMET
BITn binary digit (n) Boolean inputs 1 to 16 to PACK; and outputs 1 to 16 from
UNPACK
COUNT counter analogue quantity of completed test cycles
CMD command analogue encoded outputs from application to RMET
DIC digital input
configuration Boolean configures the ITSTM to test simplex or dual input
modules
DIM digital input mode analogue coded output from ITSTM to DIPT
DOM digital output mode analogue coded output from OTSTM to RMET
FLTA fault A Boolean output from DIPT or RMET, meaning channel fault
on slice A
FLTB fault B Boolean output from DIPT or RMET, meaning channel fault