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© <strong>Siemens</strong> AG 2007<br />
<strong>Slaves</strong><br />
Modules with Special Functions<br />
Counter modules<br />
■ Overview<br />
This module is used to send hexadecimally coded count values<br />
(LSB=D0, MSB=D3) to a higher level controller. The count value<br />
is increased by one for each valid count pulse at terminal 8. Beginning<br />
at 0, the module counts up to 15 and then begins again<br />
at 0. The controller adopts the current value and determines the<br />
number of pulses between two host invocations through subtraction<br />
from the previous value. The total number of count<br />
pulses is determined by adding these differences.<br />
For the values sent to be unambiguous, no more than 15 count<br />
values are allowed between two host invocations or AS-Interface<br />
master invocations at terminal 8. The maximum permissible<br />
transmission frequency is calculated from these times:<br />
f TRmax = 15 / T max<br />
T max : maximum possible transmission time from the slave to the<br />
host<br />
Another condition for the maximum frequency is the pulse<br />
shaped required. For the counter to accept a pulse as valid, a<br />
Low must have been applied at the input for at least 300 µs and<br />
a High for at least 1 ms. This results in a controller-independent<br />
maximum frequency of<br />
f Cmax = 1 / 1.3 ms = 769 Hz for the counter module (see following<br />
graphic).<br />
If the time criterion stipulated in the graphic is violated, the count<br />
value is rejected.<br />
The counter is active only for the reset parameter P2 (default).<br />
The counter is deleted when P2 is set, and the incoming count<br />
pulses are not registered until after P2 is reset again.<br />
Note: A customized function block is necessary or must be<br />
programmed.<br />
ASi+ ASi-<br />
+<br />
ASi<br />
IN1<br />
ADDR<br />
IN1 -<br />
NSA0_00085<br />
Terminal 4: Bus connection ASi+<br />
Terminal 5: Bus connection ASi-<br />
Terminal 6: unused<br />
Terminal 7: Sensor supply+<br />
Terminal 8: Counter input<br />
Terminal 9: Sensor supply-<br />
5<br />
7 1 <br />
5 ) & "<br />
Connection options<br />
I<br />
! I<br />
J<br />
■ Selection and ordering data<br />
Version DT Order No. Price<br />
per PU<br />
Counter modules<br />
PU<br />
(UNIT,<br />
SET,<br />
M)<br />
PS* PG Weight<br />
per PU<br />
approx.<br />
kg<br />
• With screw terminal connection A 3RK1 200-0CE03-0AA2 1 1 unit 121 0.104<br />
• With spring-loaded terminal connection B 3RK1 200-0CG03-0AA2 1 1 unit 121 0.091<br />
3RK1 200-0CE03-0AA2<br />
3RK1 200-0CG03-0AA2<br />
* You can order this quantity or a multiple thereof.<br />
<strong>Siemens</strong> LV 1 Short Catalog · 01/2007<br />
5/23
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