Rockwell Automation 1760-xxxx Pico GFX-70 Controllers User Manual - Manual (Page 178)

Publication 1760-UM002B-EN-P - March 2005
4-68 Wiring with Pico GFX-70
The NOT sequence operates according to the following rules:
>I1
, positive value
Negate value of
>I1
and subtract 1:
-|
>I1
| - 1 =
>I2
>I1
, Negative value
Value of
>I1
and subtract 1:
|
>I1
| - 1 =
>I2
Counters
Pico GFX-70 provides 32 up/down counters from C 01 to C 32. The counter
relays allow you to count events. You can enter upper and lower threshold
values as comparison values. The contacts will switch according to the actual
value. To specify a start value, for example, counting from the value 1200, this
can be implemented using a “C ..” counter.
The “C..” counters are cycle time dependent.
Wiring of a Counter
You integrate a counter into your circuit in the form of a contact and coil. The
counter relay has different coils and contacts.
Value
>I2
: Omitted
Result
QV>
: -13220
dec
=
11111111111111111100110001011100
bin
IMPORTANT
To prevent unpredictable switching states, use each coil of a
relay once only in the circuit diagram.