Dual-channel mode and discrepancy time – Rockwell Automation 1734-IE4S POINT Guard I/O Safety Modules User Manual User Manual
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Rockwell Automation Publication 1734-UM013J-EN-P - July 2014
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Safety Inputs, Safety Outputs, and Safety Data
Chapter 2
Dual-channel Mode and Discrepancy Time
To support dual-channel safety devices, the consistency between signals on two
channels can be evaluated. Either equivalent or complementary can be selected.
If the length of a discrepancy between the channels exceeds the configured
discrepancy time (0…65,530 ms in increments of 10 ms), the safety input data
and the individual-safety input status turn off for both channels. In Dual-channel
Complimentary mode, the safety input data goes to off/on for input channels
n/n+1 respectively as described in
This table shows the relation between input terminal states and controller input
data and status.
IMPORTANT
The dual-channel function is used with two consecutive inputs that are paired
together, starting at an even input number, such as inputs 0 and 1, 2 and 3,
and so on.
IMPORTANT
If you are using the safety application instructions with a GuardLogix
controller, set the module’s inputs to Single (default). Do not use the modules’
dual-channel mode as this functionality is provided by the safety application
instructions.
Table 3 - Terminal Input Status and Controller I/O Data
Dual-channel Mode
Input Terminal
Controller Input Data and Status
Dual-channel
Resultant
Data
Dual-channel
Resultant
IN0
IN1
Safety
Input 0 Data
Safety
Input 1 Data
Safety
Input 0 Status
Safety
Input 1 Status
Dual-channels, Equivalent
OFF
OFF
OFF
OFF
ON
ON
OFF
Normal
OFF
ON
OFF
OFF
OFF
OFF
OFF
Fault
ON
OFF
OFF
OFF
OFF
OFF
OFF
Fault
ON
ON
ON
ON
ON
ON
ON
Normal
Dual-channels, Complementary OFF
OFF
OFF
ON
OFF
OFF
OFF
Fault
OFF
ON
OFF
ON
ON
ON
OFF Normal
ON
OFF
ON
OFF
ON
ON
ON Normal
ON
ON
OFF
ON
OFF
OFF
OFF
Fault