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Local Safety I/O Functions
Dual Channel Evaluation
Discrepancy Time Evaluation (Monitoring Logic Discrepancies between Two Inputs)
The following actions can be performed if Dual Channel Mode is set:
• Evaluating the data of two inputs and inputting the results to safety logic
operations.
• Evaluating the discrepancy time between the data of two inputs.
Channel mode
Single Channel
Dual Channel Equiv-
alent
Dual Channel Com-
plementary
Note
These symbols are used for notation in the display for confirming I/O settings
in the Safety Wizard.
The data input to the safety input terminals is checked for logic discrepancies
using dual channels when dual channel mode is set.
Channel mode
SIngle Channel
Dual Channel
Equivalent
Dual Channel
Complementary
n = Even number
For two inputs set in Dual Channel Mode, the time is monitored from a change
in the value of one input to a change in the value of the other input (called the
discrepancy time). When the value of the other input does not change within
the set discrepancy time, it is treated as an error. The discrepancy time can
be set in increments of 10 ms between 0 (disabled) and 65,530 ms. In the
Safety Wizard, it is set to 500 ms. The discrepancy time cannot be set in Sin-
gle Channel Mode.
Symbol
---
Used as an independent safety input.
[e]
Used as a Dual Channel Equivalent Input with the
paired safety input.
[c]
Used as a Dual Channel Complementary Input
with the paired safety input.
Input signals of
Value after
safety input
evaluation
terminals
IN (n)
IN (n+1)
IN (n)
0
---
0
1
---
1
0
0
0
0
1
0
1
0
0
1
1
1
0
0
0
0
1
0
1
0
1
1
1
0
Section 2-3
Description
Meaning of status
IN (n+1)
---
Inactive (OFF)
---
Active (ON)
0
Inactive (OFF)
0
Discrepant
0
Discrepant
1
Active (ON)
1
Discrepant
1
Inactive (OFF)
0
Active (ON)
1
Discrepant
27
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