Rockwell Automation T8448 Trusted TMR Zone Interface Module - 40 Channel - Manual (Page 24)

Trusted
TM
Module T8448
Issue 14 Apr 10 PD-T8448 24
The least significant 3-bits indicate the operational state of the channel. When configured as an output,
the states have the following meaning.
Value Description
7 Channel Fault
6 Field fault (e.g. field leakage to 0V or 24V)
5 Short circuit in field wiring or load
4 Output energised (ON)
3 Open circuit in field wiring or load
2 Output de-energised (OFF)
1 No field supply voltage
0 Unused
Table 7 Rack 2: STATE Output bit descriptions
When configured as an input channel, the states are allocated to voltage ranges. The usual definition
for a digital input is as follows.
Value Description
7 Channel Fault
6 Over Range
5 Short circuit
4 Contact Closed
3 Contact Indeterminate
2 Contact Open
1 Open Circuit
0 Under Range
Table 8 Rack 2: STATE Input bit descriptions
Note that channels configured as inputs do not have a direct Boolean indication of the input status. The
Toolset application must be programmed to recognise states 2 and 4 above as open and closed
contact input respectively. All other states are treated as fault conditions; the input status determination
in these states is application specific.