Rockwell Automation 1772-LP3 PLC - 2/30 Programmable Controller Programming and Operations Manual - Manual (Page 157)

Output Override and I/O Update Instructions
Chapter 7
7Ć15
Figure 7.8
Alternate Independent Fault Zone Programming for Individual I/O
Chassis
| / |
03
( MCR )
125
( MCR )
Programming for Rack Group 2
Independent programming for I/O configuration in Figure 7.5
When a fault status bit is set on, the MCR or ZCL zone is false and controls all outputs in the zone.
The alternate program is enabled when fault status bit 125/00 is set on.
( MCR )
Programming for Rack Group 1 (Local)
( MCR )
Alternate Programming When Rack Group 2 Faults
| / |
03
125
( MCR )
( MCR )
Programming for Rack Groups 3 and 4
End
| / |
17
125
| / |
16
125
| / |
15
125
| / |
14
125
| / |
13
125
| / |
11
125
The time required to perform scans of I/O differs depending upon whether
the I/O racks are local or remote.
The scan time for local systems is 0.5 ms per rack.
The scan time for remote systems depends upon the baud rate for which
the 1772-SD2 distribution panel is configured by the on-board switches. If
no block transfer modules are used in remote racks, the scan times per
1771-AS adapter 8.5 ms and 7 ms for rates of 57.6K and 115.2K baud
respectively. Block transfer times vary depending on system configuration
and are discussed in detail in documentation on the remote PLC-2 I/O
system.
7.5
I/O Update Times
7.5.1
Local Systems
7.5.2
Remote Systems