Rockwell Automation 1760-xxxx Pico Controller User Manual - Manual (Page 176)

Publication 1760-UM001D-EN-P - September 2005
8-8 Inside Pico
An input signal, S1, must be present at the input terminal for at least
20 ms before the switch contact will change from 0 to 1 (A) in the
program. If applicable, this time must also include the program cycle
time (B) since Pico does not detect the signal until the start of a cycle.
The same debounce delay (C) applies when the signal drops out from
1 to 0.
Typical delay times with the input debounce delay turned off are a
few hundred µs, and are given in the specifications in Appendix A.
Delay Times for Pico AC Units (1760-L12AWA-xx and
1760-L18AWA-xx)
The input delay with AC voltage signals depends on the frequency:
• On-delay:
– 66 ms at 60 Hz, 80 ms at 50 Hz
• Off-delay:
– I1 to I6 and I9 to I12: 66 ms at 60 Hz, 80 ms at 50 Hz
– I7 and I8: 150 ms at 60 Hz, 160 ms at 50 Hz
(1760-L12AWA-xx)
– I7 and I8: 66 ms at 60 Hz, 80 ms at 50 Hz (1760-L18AWA-xx)
IMPORTANT
Check that there is no electrical interference affecting
the input signals when the input delay is disabled.
Pico responds even to very short signals.
1
0
1
0
S1
B
A C
B
A
2. 1. 2. 1.
B
S1