ABB Symphony Harmony Series - Redundant I;O Block

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 CodesFunction 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
TimerTimer
Timer in this section).
Figure 3-15. Redundant I/O Block
T00816C
TERMINATION BASE FO R
REDUNDANT I/O MODULES
TWO IDENTICAL
I/O M OD UL E S
REDUNDANT
I/O B L O C K