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5.10
Switch and relay blocks
5.10.1
Latching relays
Function
The input parameters "Set" and "Reset" set the output to 1 or 0:
● Set
A positive edge (0 → 1) sets the output to 1.
● Reset
A positive edge (0 → 1) sets the output to 0.
The parameters "Set" and "Reset" both have a latching function.
When "Set" and "Reset" have the same value (both = 0 or both = 1) the switching of the
output is controlled by the function parameter "RS/SR priority":
● SR: The output is set to 1.
● RS: The output is set to 0.
Table 5- 3
RS/SR priori-
RS / SR
RS / SR
RS / SR
Diagrams
The two following diagrams in which the RS/SR priority is programmed differently are
examples showing the effect on the output.
The blue arrows indicate value changes of the output Q that are caused by the programming
of the RS/SR priority.
RTU3030C
Operating Instructions, 09/2017, C79000-G8976-C382-04
Status table:
Value of
ty
"Reset"
0
1
0
RS
1
SR
1
Value of
Value of the
"Set"
output
0
-
0
0
1
1
1
0
1
1
5.10 Switch and relay blocks
Remark
The value of the output remains un-
changed.
Value of the output regardless of
RS/SR priority
Value of the output regardless of
RS/SR priority
Programming
245
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