Rockwell Automation 1775-KA PLC-3 Communication Adapter Module User Manual - Manual (Page 17)

Installation
Chapter 2
2Ć5
Indicators
There are three sets of LED indicators on the front of the 1775–KA
module (Figure 2.1). The first group, labeled SELF–TEST, indicates the
result of internal diagnostic tests that the module continuously performs
on its own hardware and firmware. The second group, labeled MODEM
INTERFACE, indicates the status of communication through the module’s
RS–232–C port. The last group, labeled DATA HWY, indicates the status
of communication through the module’s Data Highway port.
Table 2.B. tells what each indicator means.
Table 2.B
LED Indicators
Indicator
Group
Indicator
Label
Normal
State Meaning When ON
Self-Test PASS
FAIL
ON
OFF
Module has passed its own internal diagnostic test
Module has failed its own internal diagnostic tests
Modem
Interface
XMTG
RCVG
ERR
DIS
OFF
OFF
OFF
OFF
Module is transmitting a message over the modem interface port
Module is receiving a message over the modem interface port.
User programming error
Module is disabled due to a fault in the PLC-3 processor, or modem interface
port is disabled through the LIST function
Data
Highway
XMTG
RCVG
RDY
ERR
DIS
OFF
OFF
ON or [1]
OFF
OFF
OFF
Module is transmitting a message over the Data Highway port
Module is receiving a message over the Data Highway port
Module is ready to transmit a message over the Data Highway port and is
waiting to acquire mastership of the highway
User programming error or communication error on either the Data Highway or
the Modem port
Module is disabled due to a fault in the PLC-3 processor, or Data Highway port
is disabled through the LIST function
[1] Depends on amount of data highway activity