Read File Record (Fc: 14H) (Sc: 06H) - Mitsubishi Electric MELSEC iQ-R Series Reference Manual

3.14

Read File Record (FC: 14H) (SC: 06H)

Operation description
Reads the values of multiple extended file register areas.
Request message format (from master to slave)
Function code
Number of Reference
bytes m×7 number
14H (06H)
• File number specification: The upper limit of the file numbers that can be received by an Ethernet-equipped module is the file register size of the mounted
CPU module.
• Specify the number of sub requests, m, so that the size of the protocol data unit of the request message
does not exceed 253 bytes. The request message will be discarded if the following condition is not met.
[Conditional formula] 253  2 + (m  7)
• Specify the total number of read points of each sub request, N (n1 + ... + nm), so that the size of the protocol
data unit of the response message does not exceed 253 bytes. The slave will return an abnormal response
if the following condition is not met.
[Conditional formula] 253  2 + (m  2) + (N  2)
Data
Sub-request 1
File number specification Read start device number
(0000H to FFFFH) (0000H to 270FH)
(H) (L) (H)
Number of bytes m×7
Reference File number specification
number
(06H) (0000H to FFFFH)
(H) (L)
Number of bytes m×7
Number of read points n1
(0001H to 007CH)
(L) (H)
Data
Sub-request m
Read start device number Number of read points nm
(0000H to 270FH) (0001H to 007CH)
(H) (L) (H)
3 MODBUS STANDARD FUNCTION DETAILS
3.14 Read File Record (FC: 14H) (SC: 06H)
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