Rockwell Automation 2711E-xxxx PanelView Operator Terminals User Manual - Manual (Page 141)

8–7 Troubleshooting PanelView Terminals
Publication 2711E-821 – January 1998
Consult the following table to identify PLC communication
problems over Remote I/O.
Problem Cause What to do:
“PLC Communication Lost” message on the
PanelView terminal. Cable problem. Check termination and cable pin
assignments.
БББББББББББББ
Б БББББББББББ Б
БББББББББББББ
БББББББББББ
Б БББББББББ Б
БББББББББББ
Rack assignments in the terminal and PLC
do not match.
БББББББББББ
Б БББББББББ Б
БББББББББББ
Make sure rack assignments in PLC match
those in the terminal.
БББББББББББББ
Б БББББББББББ Б
Б БББББББББББ Б
Б БББББББББББ Б
БББББББББББББ
БББББББББББ
Б БББББББББ Б
Б БББББББББ Б
Б БББББББББ Б
БББББББББББ
Terminating resistor not installed properly.
БББББББББББ
Б БББББББББ Б
Б БББББББББ Б
Б БББББББББ Б
БББББББББББ
The terminating resistor must be installed at
both ends of the link:
150
W 1/2 watt resistor for 57.6 or 115.2
kbaud
82
W 1/2 watt resistor for 230 kbaud
PanelView terminal and Remote I/O
Scanners baud rate do not match. Change the Remote I/O baud rate in the
PanelView terminal or the scanner so they
match.
“PLC Communication Lost” message when using
the PanelView terminal with PLC-5. The terminal has been assigned to multiple
or partial racks when firmware revision of
PLC-5 does not support partial rack
addressing. Configure the PanelView 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.
PLC is not configured to recognize the
terminal’s rack assignments. Refer to your PLC-5 User’s Manual
regarding Auto Configuration.
Partial PLC Comms Lost – Some racks (buttons
or indicators) may still be active. The rack has been disabled. Re-enable the rack by using the PLC
Programming Software.
БББББББББББББ
Б БББББББББББ Б
БББББББББББББ
Periodic “PLC Communication Lost” when using
1772-SD2 scanner with PLC-2s. БББББББББББ
Б БББББББББ Б
БББББББББББ
БББББББББББ
Б БББББББББ Б
БББББББББББ
Must use 1772-SD2 scanner Rev. 3 or later.
БББББББББББББ
Б БББББББББББ Б
БББББББББББББ
Rapid blinking of “PLC Communication Lost”
when using 1775-S4A scanner with a PLC-3.
БББББББББББ
Б БББББББББ Б
БББББББББББ
БББББББББББ
Б БББББББББ Б
БББББББББББ
Must use 1775-S4A scanner Series B or
later.
“PLC Communication Lost” when using SLC 500
1747-SN Scanner Module. The 1747-SN Scanner Module is not
configured correctly. Refer to 1747-RIO Scanner User’s Manual
regarding Specialty I/O Configuration and
how to configure Mfiles and Gfiles.
Verify that the PanelView terminal and the
1747-SN Scanner Module Remote I/O baud
rates are set the same.
БББББББББББББ
Б БББББББББББ Б
БББББББББББББ
Discrete I/O works but block transfer does not. No
“PLC Communication Lost” message. Using
PLC-5/15, partial rack addressing.
БББББББББББ
Б БББББББББ Б
БББББББББББ
БББББББББББ
Б БББББББББ Б
БББББББББББ
Must use PLC-5/15 series B Rev. J or later.
Discrete I/O works but block transfer does not. No
“PLC Communication Lost” message. Block transfer assignments in the terminal
do not match block transfer instructions in
PLC. Make sure PLC block transfer instruction
parameters match the terminal parameters.
БББББББББББББ
БББББББББББББ
PLC Controller rack fault on rack assigned to the
PanelView 1200e terminal.
БББББББББББ
БББББББББББ
Specified No for Last Chassis when the
terminal is the last chassis in that rack.
БББББББББББ
БББББББББББ
Set Last chassis to Yes for that rack
assignment.
БББББББББББББ
Б БББББББББББ Б
Б БББББББББББ Б
БББББББББББББ
“PLC Communication Lost” message and rack
fault on rack assigned to the PanelView 1200e
terminal. БББББББББББ
Б БББББББББ Б
Б БББББББББ Б
БББББББББББ
Mismatched baud rate on the terminal and
PLC. БББББББББББ
Б БББББББББ Б
Б БББББББББ Б
БББББББББББ
Specify same baud rate for the terminal and
PLC.
БББББББББББББ
Б БББББББББББ Б
БББББББББББББ
БББББББББББ
Б БББББББББ Б
БББББББББББ
Multiple devices configured for the same
rack assignment.
БББББББББББ
Б БББББББББ Б
БББББББББББ
Multiple remote I/O devices must have
unique rack assignments.
PLC Communication
Problems: Remote I/O