Mitsubishi FX3U-232-BD User Manual

D-83
FX Series PLC User's Manual - Data Communication Edition
Computer Link
9 Related Data
9.2 Details of Related Devices
A
Common Items
B
N:N Network
C
Parallel Link
D
Computer Link
E
Inverter Communication
F
Non-Protocol Communication (RS/RS2 Instruction)
G
Non-Protocol Communication (FX
2N
-232IF)
H
Programming Communication
I
Remote Maintenance
Apx.
Discontinued models
9.2.6 On-demand error flag [M8128 and M8428]
These devices turn ON when an error is included in a specified value for data sending used with the on-
demand function.
1. Detailed contents
When the amount of on-demand data is incorrect, the on-demand error flag turns ON.
In all PLCs except FX
3U and FX3UC PLCs using communication port ch1, M8128 turns ON.
In FX
3U and FX3UC PLCs using communication port ch2, M8428 turns ON.
2. Cautions on use
While the on-demand error flag is ON, data sending is disabled for the on-demand function.
When sending data from a PLC using the on-demand function, set to OFF the on-demand error flag.
9.2.7 On-demand data word/byte changeover [M8129 and M8429]
These devices specify the unit (word or byte) of on-demand data.
1. Detailed contents
Use this device to specify the data unit sent using the on-demand function.
Set these devices to ON to specify "byte" (8-bit). Set these devices to OFF to specify "word" (16-bit).
In all PLCs except FX
3U and FX3UC PLCs using communication port ch1, use M8129.
In FX
3U and FX3UC PLCs using communication port ch2, use M8429.
2. Cautions on use
When the unit is set to "word", the amount of on-demand data units is equivalent to the number of data
registers for sending.
When the unit is set to "byte", two on-demand data units use one data register for sending.
Example: When the amount of on-demand data is "5", the amount of data registers for sending is "3".
9.2.8 Serial communication error code [D8063 and D8438]
These devices store the error codes during serial communication.
1. Detailed contents
When the serial communication error flag (M8063 or M8438) turns ON, a corresponding error code is stored
in these devices.
In all PLCs except FX
3U and FX3UC PLCs using communication port ch1, an error code is stored in D8063.
In FX3U and FX3UC PLCs using communication port ch2, an error code is stored in D8438.
The error code list is shown below:
2. Cautions on use
Error codes are not cleared even after communication recovers its normal status.
Clear them by switching the PLC mode from STOP to RUN.
Device
Error
code
Error item Contents of error
D8063
(ch1)
6301
Parity, overrun or
framing error
The transfer data is abnormal.
6305 Command error
When the station number was FF, any command other than "GW"
was received.
6306 Monitoring timeout
The received message was insufficient. Because normal message
was not received within the time-out time setting, the transfer
sequence was initialized.
D8438
(ch2)
3801
Parity, overrun or
framing error
The transfer data is abnormal.
3805 Command error
When the station number was FF, any command other than "GW"
was received.
3806 Monitoring timeout
The received message was insufficient. Because normal message
was not received within the time-out time setting, the transfer
sequence was initialized.

Mitsubishi FX3U-232-BD Specifications

General

Brand	Mitsubishi
Model	FX3U-232-BD
Category	Controller
Language	English