Rockwell Automation 1732DS-IB8 User Manual page 27

Terminal Input Status and Remote I/O Data
Dual-channel Mode Input Terminal
IN0
Dual-channels, OFF
Equivalent
OFF
ON
ON
Dual-channels, OFF
Complementary
OFF
ON
ON
Set Dual-channel Mode and Discrepancy Time
The consistency between signals on two channels can be evaluated.
Either equivalent or complementary can be selected. This function
monitors the time during which there is a discrepancy in the logic
between the two channels set as dual channels.
If the length of the discrepancy exceeds the set discrepancy time
(0...65,530 ms in increments of 10 ms), the safety input data and the
individual-safety input status turns off for both inputs.
IMPORTANT
The following table shows the relation between terminal input status
and remote I/O data.
Remote I/O Data
IN1 Safety Input 0 Safety Input 1 Status of
OFF OFF OFF
ON OFF OFF
OFF OFF OFF
ON ON ON
OFF OFF ON
ON OFF ON
OFF ON OFF
ON OFF ON
Understand the Operation of Safety Functions
The dual-channel function is used with two
consecutive inputs that start from even input
numbers such as inputs 0 and 1, inputs 2 and 3, and
inputs 4 and 5.
Status of
Safety Input 0 Safety Input 1
ON ON
OFF OFF
OFF OFF
ON ON
OFF OFF
ON ON
ON ON
OFF OFF
Publication 1791DS-UM001H-EN-P - April 2009
23
Meaning of Data
and Status
OFF, normal (OK)
OFF, fault
OFF, fault
ON, normal (OK)
OFF, fault
OFF, normal (OK)
ON, normal (OK)
OFF, fault