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PLC Communication Problems
Problem
PLC Communication Lost" message on the
PanelView 1200 terminal.
PLC Communication Lost" message when
using the PanelView 1200 terminal with PLC 5.
Periodic PLC Communication Lost" when using
1772 SD2 scanner with PLC 2s.
Rapid blinking of PLC Communication Lost"
when using 1775 S4A scanner with a PLC 3.
PLC Communication Lost" when using SLC 500
1747 SN Scanner Module.
Discrete I/O works but block transfer does not.
No PLC Communication Lost" message. Using
PLC 5/15, partial rack addressing.
Discrete I/O works but block transfer does not.
No PLC Communication Lost" message.
PLC Controller rack fault on rack assigned to the
PanelView 1200 terminal.
PLC Communication Lost" message and rack
fault on rack assigned to the PanelView 1200
terminal.
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Consult the following table to identify PLC communication problems.
Cause
PLC controller is in Program or Remote Program
mode.
Cable problem.
Incorrectly defined terminal as Last Chassis.
Rack assignments in the PanelView 1200
terminal and the PLC do not match.
Terminating resistor not installed properly.
The PanelView 1200 terminal and Scanners
Remote I/O baud rate do not match.
The PanelView 1200 terminal has been
assigned to multiple or partial racks when
firmware revision of PLC 5 does not support
partial rack addressing.
PLC controller is not configured to recognize the
PanelView 1200 terminal's rack assignments.
The 1747 SN Scanner Module is not properly
configured.
Block transfer assignments in the PanelView
1200 terminal do not match block transfer
instructions in PLC.
Specified No for Last Chassis when the
PanelView 1200 terminal is the last chassis in
that rack.
Mis matched baud rate on the PanelView 1200
terminal and PLC controller.
Multiple devices configured for the same rack
assignment.
Appendix B
Troubleshooting
What to do
Change PLC controller to Run mode.
Check termination and cable pinout.
Set Last Chassis to No for that rack assignment.
Make sure rack assignments in the PLC
controller match those in the PanelView 1200
terminal.
The terminating resistor must be installed at the
PLC and at the end of the link:
150 1/2 watt resistor for 57.6 or 115.2 kbaud
82 1/2 watt resistor for 230 kbaud
Change the Remote I/O baud rate in the
PanelView 1200 terminal or the scanner so they
match.
Configure the PanelView 1200 terminal as a
single full rack.
Upgrade PLC 5/15 to Series B Revision H or
later.
Upgrade PLC 5/25 to Series A Revision D or
later.
Refer to your PLC 5 User's Manual regarding
Auto Configuration.
Must use 1772 SD2 scanner Rev. 3 or later.
Must use 1775 S4A scanner series B or later.
Refer to 1747 RIO Scanner User's Manual
regarding Specialty I/O Configuration and how to
configure Mfiles and Gfiles.
Verify that the PanelView 1200 terminal and the
1747 SN Scanner Module Remote I/O baud
rates are set the same.
Must use PLC 5/15 series B Rev. J or later.
Make sure PLC block transfer instruction
parameters match the PanelView 1200
parameters.
Set Last chassis to Yes for that rack assignment.
Specify same baud rate for the PanelView 1200
terminal and PLC controller.
Multiple remote I/O devices must have unique
rack assignments.
B-3
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