Detailed Explanation Of Setting Data - Mitsubishi Electric MELSEC FX3U Programming Manual

Melsec fx series programmable logic controllers
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FX
/FX
/FX
Series Programmable Controllers
3G
3U
3UC
Programming Manual - Basic & Applied Instruction Edition

34.4.1 Detailed explanation of setting data

Details of the setting data in the FLRD instruction are as shown below.
Setting items
S
1
S
2
+1
S
2
+2
S
2
+3
S
2
D
1
D
2
n
Cautions
• The FLRD instruction is completed abnormally if a CompactFlash
• The FLRD instruction may require several scans to acquire data. Use the acquired data only after
confirming completion of the FLRD instruction if data consistency is required.
• It is necessary to set the device number in a multiple of 16 when a bit device is specified in
read data type is anything other than bit. When a word device is specified in
is bit, the FLRD instruction stores data read from the least significant bit of the specified word device.
• When the data type is anything other than character string and the number of devices which store the read
data is insufficient, the FLRD instruction does not read data from the CF-ADP. An error occurs.
When the data type is a character string, the character string length is unknown. The PLC stores as much
read data as possible. When reading is not completed even after the final device is reached, an error
occurs.
• It is not permitted to use an RS (FNC 80)/RS2 (FNC 87)/IVCK (FNC270)/IVDR (FNC271)/IVRD (FNC272)/
IVWR (FNC273)/IVBWR (FNC274) instruction and an FLCRT (FNC300)/FLDEL (FNC301)/
FLWR (FNC302)/FLRD (FNC303)/FLCMD (FNC304)/FLSTRD (FNC305) instruction for the same port.
796
File ID : K0 to K63
Specify the data reading type
K0 : Mixed type
K1 : Bit type
K2 : Decimal type (16-bit)
K3 : Decimal type (32-bit)
K4 : Hexadecimal type (16-bit)
K5 : Hexadecimal type (32-bit)
K6 : Real numbers(Floating point data) Exponent expression type (32-bit)
K7 : Character string (512 half-width/full-width characters maximum)
Specify the line position from which data is read.
Line position : K1 to specified maximum number of lines
Specify the column position from which data is read.
Column position : K1 to K254
Read points : K1 to K254
Device which stores the read data
Specify the head of devices which store the data read from the CompactFlash
Number of data points existing in the specified line
K1 to K254
K0 : No data
Channel number used by the CF-ADP
K1 : ch1
K2 : ch2
34 FX3U-CF-ADP Applied Instructions – FNC300 to FNC305
Description
TM
card is not mounted.
34.4 FNC 303 – FLRD / Data read
Data Type
16-bit binary
16-bit binary
16-bit binary
16-bit binary
16-bit binary
16-bit binary
TM
card.
16-bit binary
16-bit binary
and the
D
1
and the read data type
D
1

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