14 FLEX I/O Digital DC Output Modules
Publication 1794-IN094D-EN-P - July 2018
Configuring your 1794-OB8EP Output Module
Configure your output module by setting bits in the configuration word
Program the 1794-OB8EP
If your program automatically checks for fault bits, bits 8…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.
Reset a Fault on the 1794-OB8EP – Faults can be reset 3 ways: Press the fault reset
button on the front of the module; or toggle the output reset bit (write word 1, bit 08); or
cycle backplane power.
Use the Reset Button on the 1794-OB8EP – When you press the reset button, the fault
indicator for the faulted output turns off for about 1.2 s. After the 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 Memory Map for the 1794-OB8EP Module
Dec 1514131211109876 543210
Oct 17161514131211107 6 5 4 3 2 1 0
Read F7 F6 F5 F4 F3 F2 F1 F0 Reserved
(1)
(1)
The unused lower byte in read word 1 floats during operation. Do not use this byte for fault status. See Program the 1794-OB8EP.
Write Not used FR O7 O6 O5 O4 O3 O2 O1 O0
Where: O = Output – O0 corresponds to output 0, 01 corresponds to output 1, and so on.
F = Overload fault bit – 1 = fault present; 0 = no fault
FR = Fault reset bit – 1 = reset output; 0 = no change
MVM
CMP
Source
Mask
Destination
MASKED MOVE
Compare
Expression
N9: < > 0
I:010
FF00
N9:0
O:000
( Out )
This rung turns on output if a fault occurs.
This rung masked bits 8 thru 15.
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