617
Responding to Displayed Error Messages
Section 11-2
Probable Causes and Remedies
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
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 NT631/NT631C.
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 Section 4 “Connecting to the Host from the
RS-232C Port”, and Section 5 “Connecting to the Host
from the RS-422A/485 Port”.
Noise caused data corruption during
communication.
Carry out grounding work in accordance with the
conditions by referring to 3-1-4 “Grounding”, page 40.
FCS (Check Sum) Error
Noise caused data corruption during
communication.
Carry out grounding work in accordance with the
conditions by referring to 3-1-4 “Grounding”, page 40.
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 Section 4 “Connecting to the Host from the
RS-232C Port”, and Section 5 “Connecting to the Host
from the RS-422A/485 Port”.
The communication service of the
host is stopped. (Send/Receive)
Check that the host is capable of communicating with
the NT631/NT631C (confirm that the communication
settings of the host and NT631/NT631C 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. (6-9-12 “Setting the Time-out Interval”,
page 202) 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 by referring to 3-1-4 “Grounding”, page 40.
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
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”.
Data Over Flow Error
Communication command from the
host is too long.
(With memory link)
Set flow control method in the host.
Increase transmission interval.
Command transmission to the host is
not possible.
Check the comnminication cable.
Check the control method at the PT and the host.
Increase the communication on speed when it to slow.
Summary of Contents for Programmable Terminals NT631
Page 1: ...iii NT631 631C Programmable Terminal Operation Manual Produced March 1999...
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