Omron NT21 Series, Справочное руководство

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6-2 Section Responding to Displayed Error Messages
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The remedies to take in accordance with the displayed cause are indicated in the
table below.
Error Details Displayed Probable Cause Remedy
Parity Error
Framing Error
Over-run Error
Communication parameters/
conditions set incorrectly. Check if the settings at the host for parity bit, frame
length, communications speed, stop bit length and
flow control agree with those at the PT.
Over-run Error
The connecting cables are not
connected correctly. Check the communication cable connection and
perform a conductivity test. If there is a fault,
replace the cable. For details on communication
cables, refer to
Connecting to the Host from the
RS-232C Port in section 4 or Connecting to the
Host from the RS-422A/485 Port in section 5 in the
Setup Manual.
Noise caused data corruption during
communication. Carry out grounding work in accordance with the
conditions. (Refer to
Grounding in section 3 in the
Setup Manual.)
FCS (Check Sum) Error Noise caused data corruption during
communication. Carry out grounding work in accordance with the
conditions. (Refer to
Grounding in section 3 in the
Setup Manual.)
The PC is transmitting incorrect
data. Check the operation at the host side.
Time-out Error The connecting cables are not
connected correctly. (Send/Receive) Check the communication cable connection and
perform a conductivity test. If there is a fault,
replace the cable.
For details on communication cables, refer to
Connecting to the Host from the RS-232C Port in
section 4 or
Connecting to the Host from the
RS-422A/485 Port in section 5 in the Setup Manual.
The communication service of the
host is stopped. (Send/Receive) Check that the host is capable of communicating
with the PT (confirm that the communication
settings of the host and PT match).
Time-out Interval is too short. (Send) Set a longer value for Time-out Interval at the host
side.
Time-out Interval is too short.
(Receive) Set a longer value for Time-out Interval in the
System Menu. (Refer to
Setting the Time-out
Interval in section 6 in the Setup Manual.) It may
also be possible to solve the problem by shortening
the host cycle time.
PC Unit No. Error The unit # does not match that set
on the PC. Re-set the unit number at the host side to 0.
Noise caused data corruption during
communication. Carry out grounding work in accordance with the
conditions. (Refer to
Grounding in section 3 in the
Setup Manual.)
NAK received —— Check the settings for allocated words and bits.
If noise is a possible factor, distance the cable from
sources of noise and insert a noise filter in the
power supply line.
If using the equipment in a location subject to a lot
of noise, use a cable with a high degree of
protection against noise for the transmission route.
Also make the cable as short as possible.
Undefined Command
E The host is not supported. Check the PC model used for the host.
Error
Instruction level 3 is not effective. Check that the instruction level setting for the host is
level 1, 2, 3.
Probable Causes and
Remedies
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