Rockwell Automation 1769-OG16 Compact TTL Output Module - Manual (Page 16)

16 Compact TTL Output Module
Publication 1769-IN078A-EN-P - May 2006
Fault State Word
Word 3, the fault state word, selects the hold last
state or user-defined safe state condition for each
individual output on a system transition from Run
to Fault.
Fault Value Word
(1)
The fault value word, word 4, is used to program
the fault state value (0 = Off, 1 = On). Each
output is individually configurable for on or off.
Program to Fault Enable Bit (PFE)
Word 0, bit 0, allows the selection of which data
value, the program or fault value, to apply to the
output if a system in Program mode undergoes a
system fault, resulting in a change to the Fault
mode.
Module Default Condition
(1)
The modules default condition is all zeros.
(1)
TTL outputs are inverted (On = 1 = logic low voltage = 0…0.4V dc; Off = 0 = logic high voltage = 4.5…5.5V dc). Use a NOT
instruction in the ladder program to convert to traditional True = High logic.
Programming Conditions
Word or Bit Affected Condition Applied
Word 0, Bit 0 Program-to-fault Enable Program Value
Word 1 Program State User-defined Safe State
Word 2 Program Value Off
Word 3 Fault State User-defined Safe State
Word 4 Fault Value Off
Condition Bit Setting
User-defined Safe State 0
Hold Last State 1
Value Bit Setting
Off 0
On 1
Value Applied Bit Setting
Program 0
Fault 1