Lenze EPM−T9XX Modular system - Manual (Page 502)

Parameterising 1xcounter/16xdigital input module
32 bit counter with clock up/down evaluation (mode 2)
13
Parameter setting via PROFIBUS−DP
13.4
13.4.5
L
13.4−8 EDSPM−TXXX−9.0−11/2009
13.4.5 32 bit counter with clock up/down evaluation (mode 2)
In the mode 2 the counter operates as a clock−up/clock−down counter. The
counter can be pre−assigned with a starting value via the Rx PDO.
The counting range lies between 0 and +4.294.967.295. As soon as the upper limit
(when counting up) has been reached, the count value jumps to the lower count
limit. The moment, the lower count limit (when counting down) has been reached,
the count value jumps to the upper count limit.
A HIGH level in byte 4 (Control), bit 3 (Clear) sets the counter to zero.
When bit 2 (Load) changes from LOW to HIGH in byte 4 (Control), the counter is
pre−assigned with the starting value from byte 0 to 3 (Data In).
The software gate which releases the counting process is opened when bit 0 (Start)
in the byte 4 (Control) has HIGH level. It is closed as soon as bit 1 (Stop) has HIGH
level.
With the software gate open: With every rising edge of the signal A (E.0) the counter
is incremented by 1. With every rising edge of the signal B (E.1) the counter is
decremented by 1.
Act. value
counter
Start value counter
Data to module
Data from module
Dat
a
Out
E.0...E.7 E.0...E.7
Dat
a
Out
E.8...E.15 E.8...E.15
Dat
a
Out
Dat
a
Out
Dat
a
In
Dat
a
Out
Dat
a
Out
Dat
a
Out
Dat
a
Out
Dat
a
In
Dat
a
In
Dat
a
In
Dat
a
In
Dat
a
In
Dat
a
In
Control Dat
a
In
Ref.
Freq.
0
0
0
0
A
B
Start=1 dec
Load=4 dec
Stop=2 dec
Clear=8 dec
1
1
1
1
2
2
2
2
3
3
3
3
4
4 4
5
5 5
:
E.0
E.1
E.2
E.15
epm−t255
Fig. 13.4−9 Counter access of 1xcounter/16xdigital input in the mode 2
Clear signal
Load signal
Start/stop signal
A/B signal
Counter access