Rockwell Automation Publication 440G-UM001C-EN-P - June 2019 45
Application Examples Chapter 7
Figure 18 shows the General tab of the 1734-IB8S Module Properties.
The Input Status must be set to “Combined Status – Power – Muting” as this
setting is used by the Dual Channel Input Stop (DCS) logic block to verify
that the 1734-IB8S switch is operational. The Output Data must be set to
“Test,” as the test outputs are used to generate test pulses for the output
contactors, K1 and K2.
Figure 18 - 1734-IB8S Module Properties – General
Figure 19 shows the Input Configuration tab of the 1734-IB8S switch Module
Properties.
In this example, Points 0 and 1 monitor the OSSD outputs of the 440G-LZ
safety switch. The Type is set to Single and the Mode must be set to Safety. Set
the On- Off- delay time to 6 ms to filter out the test pulses from the 440G-LZ
safety switch.
Points 2 and 3 monitor the status of the output contactors, K1 and K2. The
Type should be set to Single. The discrepancy time will be dependent on the
contactor device. A value other than 30 ms is suggested to prevent nuisance
faults over the life of the contactors; other values can be more appropriate. Set
Mode to Safety Pulse Test. Safety pulse testing is used to detect potential faults
in the monitoring circuit.
Point 4 monitors the auxilary output of the safety switch. The auxiliary output
indicates whether or not the gate is closed. Set Type to Single and Mode to
Standard.
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