Mitsubishi FX3U-232-BD User Manual page 288

FX Series PLC User's Manual - Data Communication Edition
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9.2.11 On-demand data head device number specification [D8127 and D8427]
These devices set the head data register device number containing the data to be sent using the on-demand
function in a sequence program.
1. Detailed contents
These devices set the head data register device number containing the data to be sent using the on-demand
function.
In all PLCs except FX
D8127.
In FX and FX
3U
If there is an error in the set data, the on-demand error flag (M8128 or M8428) turns ON.
2. Cautions on use
When setting the on-demand data head device number specification device (D8127 or D8427), set the flag
using the pulse operation type.
While the on-demand send processing flag (M8127 or M8427) is ON, do not write data.
9.2.12 On-demand data quantity specification [D8128 and D8428]
These devices set the amount of data to be sent from a PLC using the on-demand function in a sequence
program.
1. Detailed contents
These devices set the amount of data to be sent using the on-demand function. Set the amount of data 64 or
less.
In all PLCs except FX
In FX and FX
3U
If an error is included in the set data, the on-demand error flag (M8128 or M8428) turns ON.
2. Cautions on use
When setting the on-demand data quantity specification device (D8128 or D8428), set the flag using the pulse
operation type.
While the on-demand send processing flag (M8127 or M8427) is ON, do not write data.
9.2.13 Time-out time setting [D8129 and D8429]
These devices set the evaluation time for error when receiving of data from the computer is interrupted.
1. Detailed contents
These devices set the error evaluation time in 10-ms units used when the receiving of data from the computer
is interrupted.
In all PLCs except FX
Set the time-out time setting using parameters when using the communication port ch2 in FX
PLCs.
Use D8429 for confirmation.
The table below shows the setting range.
FX Series
FX , FX , FX
0N 1S
FX
1NC
FX (FX), FX , FX
2 2C
FX , FX , FX
3U 2NC
2. Cautions on use
When setting the time-out time setting device (D8129) in an FX
(battery backed) device (M8120) to ON.
Make sure that the time-out time setting is not shorter than the time required to receive one character at the
set baud rate.
D-86
and FX PLCs and in FX
3U 3UC
PLCs using communication port ch2, use D8427.
3UC
and FX PLCs using communication port ch1, use D8128.
3U 3UC
PLCs using communication port ch2, use D8428.
3UC
and FX PLCs using communication port ch1, use D8129.
3U 3UC
,
1N
1 to 255 (10 to 2550 ms) (When "0" is set, it is handled as "100 ms.")
,
2N
1 to 3276 (10 to 32760 ms) (When "0" is set, it is handled as "100 ms.")
3UC
and FX PLCs using communication port ch1, use
3U 3UC
Setting range
PLC, set the communication setting latched
0N
9 Related Data
9.2 Details of Related Devices
and FX
3U 3UC