Lenze I/O system 1000 System Manual - Manual (Page 199)

Product description
I/O compound modules − counter
One counter 32 bits, 5 V DC − EPM−S602
3
l
199 EDSIO1000 EN 7.0
C) Main counting direction backwards:
Limits Counting range
Final value −2 147 483 646 (−2 31 +1) to +2 147 483 646 (2 31 −1)
Upper counting limit +2 147 483 646 (2 31 −1)
Function:
ƒ For starting the counting process the internal gate has to be opened.
– The counter counts backwards from the loading value.
– If the counter reaches the final value +1 in the negative direction, it skips to the
loading value at the next negative count pulse and continues to count from there.
– You can also count above the upper counting limit.
ƒ For stopping the counting process the internal gate has to be closed.
Upper counting
limit value
Loaded value
0
Counter starts
Time
Counter content
Final value
Counter stops
SLIO037
Fig. 3−67 Example of "Counting periodically" and main counting direction backwards