Lenze I/O system 1000 System Manual - Manual (Page 82)

Product description
I/O compound modules − digital I/O
2 digital inputs with time stamp function − EPM−S207
3
l
82 EDSIO1000 EN 7.0
Functional principle taking the example of the system bus CAN
Long cycle times or fieldbus cycle times which fluctuate depending on bus load inevitably
result in unacceptable inaccuracy when precise switching times are needed. The time
stamp function can be used to calculate switching times for outputs accurate to 1
ms.
An I/O compound module with time stamp function is fitted with an internal ticker. The
tickers within a station are all synchronised via the backplane bus to ensure the same time
base.
ƒ The ticker has a resolution of 1
ms. After power−on, it counts from 0 ... 65535 ms and
then goes back to 0.
ƒ If using I/O compound modules with the time stamp function, when the signal
undergoes a edge change, the ticker value is saved to the process image along with
the channel status.
ƒ Up to 15 DI switching orders (sub−index entries) can be transmitted with the time
stamp function.
65535 µs 0 µs 0 µs 65535 µs
0
00000001
00000001
00000011
00000000
00000001
1
4
0
1
2
3
2
4560
61210
56200
49150
16000
Sub-Index
+0
+16
+12
+8
+4
Ticker
DI1
DI2
SLIO080
Fig. 3−20 Saving the time stamp entries
DI1 Digital input 1
The time stamp entry for the edge evaluation is generated with a rising edge.
DI2 Digital input 2
The time stamp entry for the edge evaluation is generated with a falling edge.
0 Channel status
1
Running number (RN)
Counts from 0 127 and then starts with 0 again. The consecutive number reflects the
time sequence of the edges.
2 Ticker value