Technical data’s and circuit diagrams for the modular system
PCD0
26/766 E2
(HB_PCD0 26 766_E2.DOC)
SAIA-Burgess Controls Ltd.
Page 93
The PLC writes: Reset counter 1
à
word 1 = 0 ; word 5 = 1000h
10. Output X1.6 is switched off and the PLC writes everything to zero
à
word 1 = 0 ; word 5 = 0
11. Continued at step 8.
h:Hex. format
Always choose an appropriate interference suppression in relation to the
maximum input signal frequency. This ensures a safe operation of the counter.
Example:
Maximum input signal frequency = 120 Hz
à
interference suppression 200 Hz
4.18.10
FORCE, LOCK and Display mode priorities
All inputs and outputs can be overwritten in FORCE or LOCK.
FORCE/LOCK have a direct impact on inputs and outputs.
If FORCE/LOCK are selected simultaneously and override data are
sent from the PLC the following case applies:
Key:
From PLC, To PLC
Inputs, MUX, Counter, Outputs
Via PLC, Via BC, Override data, FORCE, LOCK
In Display mode counter data is displayed with four digits in hex.
format. On 32 bit counters the 4 lower and the 4 higher digits are
displayed separately. The display looks as follows this depending on
the position of the channel cursor (yellow LED):
Number and type of counters
Channel cursor position on:
Display
X1.0, X1.2, X1.4, X1.6
Counter value Z1
X1.1, X1.3, X1.5, X1.7
Counter value Z2
X2.0, X2.2, X2.4, X2.6
Counter value Z3
4 x 16 bits
X2.1, X2.3, X2.5, X2.7
Counter value Z4
X1.0, X1.2, X1.4, X1.6
Counter value Z1 MSW
X1.1, X1.3, X1.5, X1.7
Counter value Z1 LSW
X2.0, X2.2, X2.4, X2.6
Counter value Z2 MSW
2 x 32 bits
X2.1, X2.3, X2.5, X2.7
Counter value Z2 LSW
MSW: Most Significant Word
LSW: Least Significant Word
