Digital Channel Status - ABB Symphony Harmony Series Instruction

I/O Block
it could be a problem with the actual power source. A problem
with the power source, however, will cause a bad status indica-
tion on other blocks.
Field Power
The field power indicator gives a good or bad status indication
for the internal field power (IFP) or external local field power
(LFP) input to the block. The indicator appears as C for all
blocks except DIO blocks. A DIO block has two separate field
power indicators to show digital input field power status (DI)
and digital output field power status (DO). The type of power
associated with the indicator depends on the field power option
chosen for the block, either IFP or LFP.
The status indicator on indicates a good power input. The
input is tested after its front panel fuse, which means a bad
input indication could be a blown fuse, a bad connection, or it
could be a problem with the actual power source. A problem
with the power source, however, will cause a bad status indica-
tion on other blocks. This assumes there are other blocks
using the same power source however.
Digital Channels
The channel status indicators show digital input and output
channel states and status. Only digital I/O capable blocks
have channel status indicators. The indicator is the channel
number (e.g., 05, 10, 15, etc.). Refer to Table
tion of possible indicator states.
Table 7-3. Digital Channel Status
On
Single channel flashing at a steady
rate
All channels flashing at a steady and
same rate
Off
7 - 4
Indicator
7-3 for a descrip-
Channel Status
On state.
1. Readback open or short.
2. Configuration error.
Input state change error. One of the
digital inputs is changing state faster
than the module can handle. Typi-
cally caused by a problem with the
input source.
Off state.
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