User`s manual

Chapter 6 - GP RUN and Errors
GP-477R/577R Series User's Manual
6-14
PLC NOT CONNECTED (02:FF) (02:F7)
Displays when communication with the PLC has stopped for over 60 seconds,
when there is a transmission timeout error, or when there is excess noise.
Check the correspondence cable wiring and connect correctly.
RECEIVE DATA ERROR (02:FD)
This problem arises as a result of one of these three:
• There is a problem in trying to receive the data
• The connected PLC and the PLC setup for the data is different
• Noise
These errors, except for noise, appear when the Communication Cable is
pulled out when the GP unit is On, or when normal communication opera-
tions are being run, but the GP has been powered Off, then back On. To
solve the problem, simply begin running transmissions again.
When the error is a result of noise, correct any improper connections.
GP STATION NO. DUPLICATION ERROR (02:F9)
This error appears for one of two reasons:
• The GP number is same as the station number for another GP.
Check all the GP station numbers.
• In the middle of correspondences, the PLC power has been turned
On/Off. Reset the power on the PLC and GP, in that order.
NETWORK ADDRESS ERROR (02:F8)
The SIO address setup for the GP is different from other GP's. Check the
address setup for all the GP's.
PLC NOT RESPONDING (02:FE)
Displays when there is a Reply Timeout Error, or when there is excess noise.
The origin of the problem and the matching solutions are listed in the table
below.
PROBLEM SOLUTION
1. The PLC is not turned ON. 1. Turn On the host's power switch
2. GP unit INITIALIZE setup (Setup I/O,
PLC Setting) is incorrect.
2. Setup the unit correctly and match up with
the current host and Communication Cable.
3. The host and GP powering up process
was incorrect.
3. Turn the host's power On first, wait 2~3
seconds, then power up the GP unit.
4. The Communication Cable was not
connected properly.
4. Check the Communication Cable wiring
and connect it up properly.