Siemens SIRIUS 3RK3 - Counter Functions; Counter (0 -> 1)

Description of the software
6.7 Functions
Modular Safety System 3RK3
188 System Manual, 10/2008, 926 2530-02 DS 02
6.7.8 Counter functions
6.7.8.1 Counter (0 -> 1)
Description
Note
The count value is not stored. At the start of safety mode, all counters begin with their initial
values.
The safety relay supports the counter function "Counter (0 → 1)". The counter value is only
changed when there is a positive edge at the counter inputs. The current counter value can
be counted up or down via one proprietary counter input each. When a parameterizable
counter limit value is achieved or overshot, the function output Q is set.
The counter function has:
● 3 inputs: CU - Counter input up, CD - Counter input down, R - Reset
● A function output Q for the result of logic operation (RLO)
Functional principle
● The counter value is increased by 1 with every positive edge at the "Counter input up",
except when the counter value reaches the maximum value 65535.
● The count value is decreased by 1 with every positive edge at the "Count input down",
except when the count value reaches the value 0.
● The counter value remains unchanged when there is a positive edge simultaneously at
both counter inputs.
Parameters
Parameter name Description/parameter value
Name You can enter a name for the element here.
Element number Consecutive number which is automatically assigned. You can change
the number.
Element activated When this parameter is active, the function is processed in the safety
logic.
When this parameter is deactivated, the set substitute value is made
available at the output Q.
General
Function output substitute
value
"0" or "1" can be assigned to the substitute value when the element is
deactivated.
Substitute value "0" means output Q = 0
substitute value "1" means output Q = 1