IFM Electronic AS-Interface AC2216 Montageanleitung Seite 13

Analogue input module 4I, 0 ... 10V - AC2217
Range
0 ... 10V
< 0V
0 ... 10V
10.001V ...
11.5V
> 11.5V
Transmission time of the analogue values
The transmission time of the analogue values depends on the conver-
sion time of the analogue signals into digital signals in the AS-i mod-
ule and on the transmission time via the AS-Interface.
The conversion time per analogue input signal is 60ms. But if only
channel 1 is used, i.e. all other channels are deactivated via the para-
meter bits P1 and P2, the conversion time for this channel is only
20ms.
The transmission time of the 4 16-bit values via the AS-interface ideal-
ly is 7 AS-i cycles per value. For a cycle time of 5ms per AS-i cycle this
results in a transmission time of 4 * 7 * 5ms = 140ms via the AS-Inter-
face.
If the channels 2 to 4 are deactivated, the transmission via the AS-
Interface for one channel requires 7 AS-i cycles. For a cycle time of 5ms
per AS-i cycle this results in a transmission time of 1 * 7 * 5ms = 35ms
via the AS-Interface.
Thus the total transmission time for 4 analogue values ideally is 240ms
(conversion time) + 140ms (transmission time) = 380ms. If channels 2
to 4 are deactivated, the transmission time ideally is 20ms + 35ms =
55ms.
Units
dec.
0000
0000 ... 10000
10001 ... 11500
32767
Units
hex.
0000
0000 ... 2710
2711 ... 2CEC
7FFF
LED
analogue
on outside range
on nominal range
on above nominal
flashes outside range
Meaning
range
13
PAGE