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14 FLEX I/O Digital DC Output Modules
Configuring your 1794-OB8EP Output Module
Configure your output module by setting bits in the configuration word
Image Table Memory Map for the 1794-OB8EP Module
Dec
15
14
Oct
17
16
Read
F7
F6
Write
Not used
Where:
(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
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.
This rung masked bits 8 thru 15.
CMP
Compare
Expression
N9: < > 0
This rung turns on output if a fault occurs.
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.
Publication 1794-IN094D-EN-P - July 2018
13
12
11
10
15
14
13
12
F5
F4
F3
F2
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
9
8
7
6
11
10
7
6
(1)
F1
F0
Reserved
FR
O7
O6
MVM
MASKED MOVE
Source
I:010
Mask
FF00
Destination
N9:0
5
4
3
2
5
4
3
2
O5
O4
O3
O2
Program the
1794-OB8EP.
O:000
( Out )
1
0
1
0
O1
O0
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