NT31C-ST143B-EV3 Omron, NT31C-ST143B-EV3 Datasheet - Page 257

• Manufacturer Part Number: NT31C-ST143B-EV3
• Description: 5.7,8-color,dis,stn,black,eng
• Manufacturer: Omron

Specifications of NT31C-ST143B-EV3

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Responding to Displayed Error Messages
Probable Causes and
Remedies
240
Parity Error
Framing Error
Over-run Error
FCS (Check Sum) Error
Time-out Error
PLC Unit No. Error
NAK received
Undefined Command Error The host is not supported.
Error Details
Communications parameters/
conditions set incorrectly.
The connecting cables are not con-
nected correctly.
Noise caused data corruption during
communications.
Noise caused data corruption during
communications.
The PLC is transmitting incorrect
data.
The connecting cables are not con-
nected correctly. (Send/Receive)
The communications service of the
host is stopped. (Send/Receive)
Time-out Interval is too short. (Send)
Time-out Interval is too short.
(Receive)
The unit # does not match that set on
the PLC.
Noise caused data corruption during
communications.
——
Instruction level 3 is not effective.
Displayed Probable Cause
Send Errors
The following errors can occur when receiving data.
The remedies to take in accordance with the displayed cause are indicated in
the table below.
• Time out error
• Data over flow error
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 NT31/NT31C.
Check the communications cable connection and
perform a conductivity test. If there is a fault, replace
the cable. For details on communications 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.
Carry out grounding work in accordance with the
conditions by referring to 3-1-4 Grounding, page 32.
Carry out grounding work in accordance with the
conditions by referring to 3-1-4 Grounding, page 32.
Check the operation at the host side.
Check the communications cable connection and
perform a conductivity test. If there is a fault, replace
the cable. For details on communications 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.
Check that the host is capable of communicating with
the NT31/NT31C (confirm that the communications
settings of the host and NT31/NT31C match).
Set a longer value for Time-out Interval at the host
side.
Set a longer value for Time-out Interval in the System
Menu. (6-9-12 Setting the Time-out Interval,
page 186) It may also be possible to solve the prob-
lem by shortening the host cycle time.
Re-set the unit number at the host side to 0.
Carry out grounding work in accordance with the
conditions by referring to 3-1-4 Grounding, page 32.
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.
Check the PLC model used for the host.
Check that the instruction level setting for the host is
level 1, 2, 3.
Remedy
Section 7-2