Using The Fault Reset Button; Image Table Mapping - Allen-Bradley 1794-OB8EP Installation Instructions Manual

6 24V dc FLEX I/O Electronically Fused 8 Output Module

Using the Fault Reset Button

When you press the manual reset button:
the fault indicator for the faulted output turns off for about 1.2s (the
faulted output will not attempt to turn on during this delay)
after the 1.2s delay, the faulted output attempts to turn on
if the external condition causing the fault is corrected, the output will
remain on, the fault indicator is off, and the status indicator is on

Image Table Mapping

Decimal Bits
15 14
IW F7 F6
OW
OW2
Where: IW = input word
OW = output word
F = overload fault bits - 1 = fault present; 0 = no fault
Oj = output data (O0 corresponds to output 0, O1 corresponds to output 2, etc.)
FR = fault reset bit - 1 = reset output; 0 = no change.
Note: The unused lower byte in read word 1 floats during operation. Do not use this byte for fault
status. See Programming" below.
Programming
If your program automatically checks for fault bits, bits 8 through 15 of
read word 1 must be masked. This is a sample program for a module at
rack address 1, group 0. Add similar rungs to your program.
This rung masked bits 8 thru 15.
CMP
Compare
Expression
N9:0 < > 0
This rung turns on output if a fault occurs.
Publication 1794 5.20- April 1999
13 12 11 10
F5 F4 F3 F2
Not used
09 08 07 06
F1 F0
FR O7 O6
Reserved
MVM
MASKED MOVE
Source: I:010
Mask: FF00
Destination: N9:0
O:000
(
Out
05 04 03
Reserved (see note)
O5 O4 O3
)
02 01 00
O2 O1 O0