ABB Symphony Harmony Series, Instruction, Page: 150 / 402

I/O Block
WBPEEUI240751C0 3 - 21
Default States
Default states for outputs are selected during function code
configuration. The outputs will automatically return to normal
operation after communication has been restored. For an ana-
log output, the default state is either zero percent output, 100
percent output, or hold the current output. For a digital out-
put, the default state is either zero state output, one state out-
put, or hold the current output. Refer to
Function Codes
Function Codes Function Codes
Function Codes in
Section 6 for information about default state specifications.
Failure States
Failure states for outputs are by default their unpowered or off
states. A nonredundant output channel will enter its failure
state when:
•
All power to the I/O module is lost.
•
Machine fault timer error occurs (refer to Machine Fault Machine Fault Machine Fault Machine Fault
Timer Timer Timer Timer in this section).
Figure 3-15. Redundant I/O Block
T 00816C
TE R M IN ATIO N BA S E FO R
R E DU NDAN T I/O M O D ULE S
TW O ID E N TIC AL
I/O M O D U LE S
R E D U N DAN T
I/O BLO CK