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PS69-DPS ♦ CompactLogix or MicroLogix Platform Diagnostics and Troubleshooting
Profibus DP Slave Communication Module
Page 48 of 94 ProSoft Technology, Inc.
January 12, 2009
Behavior Significance Typical Reason Help
Application is not ready PLC is not in RUN Mode.
PLC application has set the
NRDY bit.
PLC has no I/O
communication with the
module Bring PLC into RUN Mode.
Check that the PLC
application has deleted the
NRDY bit.
Check PLC's I/O LED
Master and Slave
Configuration mismatch The configuration of the
master which wants to
communicate with the
module don't match to the
configuration of the slave
module Use the ExtStaInfo in
SlaveStatusField to compare
what the expected
configuration is from the
master and the modules
configuration
PS69-DPS
COM LED is off and SYS
LED flashing cyclic fast
green
Network problem No physical network
connection
No master present who
wants to communicate Check if the slave module is
properly connected to the
PROFIBUS Network
Check if bus activity can be
detected in "IrqCounter" in
SlaveStatusField
Check if a master is present
who wants to communicate
to the module and check if
the slave address is correct
Master output data can not
be found in RSLogix
program Input array mismatch Configured input size in
RSLogix too small Check if the configured input
size in RSLogix covers the
mandatory size of 136 byte
status data plus the size of
the outputs configured.
Inputs are not transferred to
Master although PROFIBUS
is running Output array mismatch Configured output size in
RSLogix too small Check if the configured
output size in RSLogix
covers the mandatory size of
4 byte status data plus the
configured PROFIBUS input
data
4.2.5 Cable
ƒ
Check that the cable is wired correctly (page 80).
ƒ
Check to confirm that the bus termination resistors are switched on at the
beginning and the end of the cable and switched off at all other connectors in
between.