Read Timing - Honeywell DCP551 Mark ΙΙ User Manual

Read timing

SW1 to 8 timing
SW9 to 16 and RUN, FAST (READY FAST) timing
Selected program
number
(8-point input)
HANDLING PRECAUTIONS
SW1 to 8 are read according to the timing in the figure shown below.
(1) When the input changes from OFF to ON, reading starts within less than 0.2 sec-
onds.
(2) When the input changes from ON to OFF, reading starts within less than 0.2 sec-
onds.
On reading
External switch
input status
(1)
Selecting SW9 to 16 program numbers takes less than 0.4 seconds after a change in
input status.
Thus the following timings (1) to (4) must be observed during RUN operations. FAST
(READY FAST) operations should follow the same timings.
(1)Time from number selection to leading edge of the RUN signal : 0.4 seconds or more
(2)Time from the leading edge of the RUN signal to number selection hold : 0.2 seconds or more
(3)Time from RUN signal OFF to leading edge of RUN signal
(4)Time from leading edge of RUN signal to RUN signal ON hold : 0.2 seconds or more
(5)Time from entry of selected number to program number change
(6)Time from leading edge of RUN signal to start of RUN signal : 0.4 seconds or less
State of numbers
not selected
RUN signal
Program number Numbers not selected
Mode
READY
To ensure correct operation, the above read timings should be regarded as min-
imum time settings in external switch operations.
Chapter 6. OPERATION
Off reading
(2)
State of selected numbers
(1) (2)
(3)
(4)
(5) (6)
Selected numbers
RUN
: 0.2 seconds or more
: 0.4 seconds or less
State of numbers
not selected
6-11