Sequence Counter - Siemens SIMATIC ET 200S Operating Instructions Manual

5.4.7

Sequence counter

The 2PULSE has a sequence counter for each channel with which the completed output
sequences are counted.
You can monitor the completion of an output sequence with the sequence counter SEC_CNT
in the feedback interface.
The counter has a width of 4 bits. After an overflow it jumps back to 0.
Function of the sequence counter
The sequence counter has the following function in the individual operating modes:
● Pulse output and pulse train
● On/Off-delay
● Pulse width modulation and frequency output
When the software enable (SW_ENABLE = 0) is created, the counter is reset to 0.
Application options
The sequence counter can be used in particular for:
● Detecting (counting) very short pulses
● Counting output sequences in connection with the hardware enable
Technological Functions
Operating Instructions, 06/2010, A5E00124867-07
– Without hardware enable the counter is set to 1 after completion of the output
sequence.
– With hardware enable, the counter is incremented after every completed output
sequence.
The counter is incremented at DO with each edge (positive and negative).
The counter does not have any function.
2PULSE
5.4 Modes and Functions
309