7-12
CE
(blinking)
modbus 
Com Err
MODBUS Communications Error
Normal reception was not possible for 
2 s or longer after received control 
data.
-
Check the communications devices 
and signals.
BUS
(blinking)
Option 
Com Err
Option Card Communications 
Error
A communications error occurred in a 
mode where the run command or a 
frequency reference is set from an 
Communications Option Card.
-
Check the communications devices 
and signals.
CALL
(blinking)
Com 
Call
Communications on Standby
Control data was not normally 
received when power was turned ON.
-
Check the communications devices 
and signals.
E-15
SI-F/G 
Com Err
SI-F/G Communications Error 
Detected
A communications error was detected 
when a run command or frequency 
reference was set from an Option Card 
and continuous operation was set for 
the E-15 operation selection.
- Check the communications signals.
Table 7.2  Alarm Displays and Processing (Continued)
Display Meaning Probable causes Corrective Actions
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