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

Description of the software
6.7 Functions
Modular Safety System 3RK3
System Manual, 10/2008, 926 2530-02 DS 02
189
Parameter name Description/parameter value
Counter limit value CV Set a counter limit value which is to be monitored (between 0 and
65535):
• Function output Q = "1" when the current counter value reaches this
limit value.
• Function output Q = "0" when the current counter value falls below
this limit value.
Parameters
Reset You can select whether the counter value is set to "0" automatically or
manually:
• Automatic
When the function output Q = "1", the counter value and function
output Q are set to "0" after one program cycle of the safety relay.
• Manual
The counter value is set to "0", irrespective of the state of the
function output Q.
If the counter value is not deleted after the limit value is exceeded,
counting will continue.
• Automatic with manual reset
When the function output Q = "1", the counter value and function
output Q are set to "0" after one program cycle of the safety relay.
The counter value can be reset to "0" when the function output Q =
"0".
See also
Messages for counter functions (Page 267)
6.7.8.2 Counter (1 -> 0)
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 (1 → 0)". The counter value is only
changed when there is a negative edge. 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)