88 Rockwell Automation Publication 1791ES-UM001G-EN-P - November 2016
Chapter 5 Configure the I/O Modules
2. Choose the Safety tab.
3. From the dialog box, choose Reset ownership.
Configuration Signature
The programming software creates the configuration signature and the safety
module verifies it. The configuration signature provides SIL 3 integrity of the
configuration of a Guard I/O module.
• When a GuardLogix controller first connects to an unconfigured Guard
I/O module, the complete configuration is downloaded to the
I/O module.
• Any time the GuardLogix controller attempts to connect to a Guard
I/O module, if the configuration signatures are the same, then the
configuration does not need to be downloaded, because they already
match.
• Any time the GuardLogix controller attempts to connect to a Guard
I/O module and the signatures do not match, the module checks the IP
address and safety network number. If these values are all correct, the
controller attempts to configure the module.
Configure the Module Inputs
Table 23 shows the typical safety input parameters available on the Input
Configuration tab. See Chapter 1
for related information.
Table 23 - Typical Safety Input Parameters
Parameter Name Value Description
Input Point Operation Type Single Channel Inputs are treated as single channel.
Dual-channel Equivalent Inputs are treated as a dual-channel pair. The channels must match (be equal) within the discrepancy time or a
fault is generated.
Dual-channel Complementary Inputs are treated as a dual-channel pair. The channels must disagree (be opposite) within the discrepancy
time or a fault is generated.
Input Point Mode Not Used The input is disabled. It remains logic 0 if 24V is applied to the input terminal.
Safety Test Pulse Pulse testing is performed on this input circuit. A test source on the module must be used as the 24V source for
this circuit. The test source is configured by using the test source pull-down. The pulse test detects shorts to
24V, and channel-to-channel shorts to other inputs.
Safety A safety input is connected but there is no requirement for the 1791ES module to perform a pulse test on this
circuit. An example is a safety device that performs its own pulse tests on the input wires, such as a light
curtain.
Standard A standard device, such as a reset switch, is connected. This point cannot be used in dual channel operation.
Safety Input Test Source None If pulse testing is being performed on an input point, then the test source that is sourcing the 24V for the input
circuit must be selected.
If the incorrect test source is entered, the result is pulse test failures on that input circuit.
Test Output 0
Test Output 1
Test Output 2
Test Output 3
Test Output 4…15
(1)
Input Delay Time
Off -> On
0…126 ms
(in increments of 6 ms)
Filter time is for OFF to ON transition. Input must be high after input delay has elapsed before it is set logic 1.
Input Delay Time
On -> Off
0…126 ms
(in increments of 6 ms)
Filter time is ON to OFF transition. Input must be low after input delay has elapsed before it is set logic 0.
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