User manual

Publication 1760-UM001A-EN-P
4-26 Drawing a Circuit Diagram with Pico
You can wire up coils RC1 and DC1 as required. Select
relay contact C1, move the cursor to 1 and press Ok.
The parameter set for counter relay C1 is displayed.
Determining Counter Frequency
The maximum counter frequency depends on the
length of the circuit diagram in Pico. The number of
contacts, coils and circuit connections used determines
the scan time (cycle time) required to process the Pico
circuit diagram.
Example: When using a Pico with only three circuit
connections for counting, resetting and outputting the result via the output, the
counter frequency may be 100 Hz.
To determine the scan time refer to Determining Cycle Time of Circuit Diagrams
on page 8-3.
The maximum counter frequency depends on the maximum scan time.
Use the following formula to determine the maximum counter frequency:
f
c
= maximum counter frequency
t
c
= maximum scan time
0.8 = correction factor
Example
The maximum scan time is t
c
= 4000 µs (4 ms).
Parameters for Counters
The parameter display for counters is used to change the counter setpoint value and
to enable or disable parameter access.
I1---------CC1
I3---------DC1
I2---------RC1
C
1
--------{Q1
0005
DIR
CNT
RES
{
{
C1
+
f
c
1
2t
c
×
--------------
0.8
×=
f
c
1
24 ms
×
---------------------
0.8 100 Hz=
×=
DIR
CNT
RES
C1
+
{
0230
{
0000
{
Setpoint
Direction Coil
Counter Coil
Reset
Actual Value
Relay Number
Parameter Display