Read Timing - Honeywell DCP301 User Manual

Chapter 6. OPERATION

Read timing

Timing of RSW1 to 7
Timing of RSW8 to 12, RUN and PV start
Handling Precautions
6-10
Inputs RSW1 to RSW7 are read according to the following timing.
(1) When input changes state from OFF to ON, the time from the change up to reading is
0.2s max.
(2) When input changes state from ON to OFF, the time from the change up to reading is
0.2s max.
External switch input state
The time from the change in input state up to reading when selecting program Nos. by
RSW8 to RSW12 is 0.4s max.
Accordingly, due to the relationship with RUN operation, be sure to observe timings
to (4) in the following diagram.
PV start operation also must conform to RUN operation.
(1) The time from fixing of the selected No. up to the rising edge of the RUN signal is
0.4s min.
(2) The time from the rising edge of the RUN signal up to holding of the program No. is
0.2s min.
(3) The time from holding of RUN signal OFF up to the rising edge of the RUN signal is
0.2s min.
(4) The time from the rising edge of the RUN signal up to holding of RUN signal ON is
0.2s min.
(5) The time from fixing of the selected No. up to changing of the program No. is 0.4s
max.
(6) The time from the rising edge of the RUN signal up to start of RUN is 0.4s max.
Program selection No.
State of No. different
(5 inputs) from that selected
RUN signal
Program No. No. different from that selected
When operating the controller by external switch inputs, operation can be carried
out more reliably if a margin is added to the minimum time for the above read
times.
ON read
(1) (2)
State of
selected No.
(1)
(3)
(5)
Selected No.
OFF read
State of No. di
from that selec
(2)
(4)
(6)