2. INDICATION MAINTENANCE B-61813E/03
The interface modules and the I/O modules with up to 16 input/output
points have LEDs toindicate their states.
2.1 INTERFACE MODULE (AIF01A) LEDS
¡PWR ¡ LINK
A I F 0 1 A
Marking Name Description
PWR Power-on On: The interface module is supplied with power
of 24 VDC.
LINK Link On: The I/O Link is operating properly.
Normally, this LED lights several to ten-odd
seconds after the master is turned on.
Base address These LEDs indicate which base unit the inter-face
module is transferring data with. If a failure occurs
(the LINK LED is turned on, then off), BA0 or BA1,
whichever is operating, is turned on.
Failures, their causes, and required actions
1) PWR is off.
Q Power (24 VDC) is not supplied or the supply voltage is
Þ Supply power of 24 VDC ± 10%.
R A The fuse in the interface module has blown.
BA1 BA0 Base number