Panasonic FP7 CPU Unit - RECV Command (MODBUS Function Code Specified Type)

6.3 MODBUS TCP Master Communication (RECV)
6.3.2 RECV Command (MODBUS Function Code Specified Type)
 Command format
 Operand
Items Settings Setting range
i Specify the operation unit. US / SS
S1
Specify the MODBUS function codes and partner station no. to be used. (Note 1) (Note 2)
Higher
byte
Two hexadecimal digits that indicate the MODBUS
function code
H1 - H4 (1 - 4)
Lower
byte
Two hexadecimal digits that indicate the station no. H1 - HF7 (1 - 247)
S2 Specify the source MODBUS address in the partner node. H0~HFFFF (0 - 65535)
n Specify the No. of sent data. (Note 3)
1 - 127 words
1 - 2040 bits
D1
Specify the device initial address of the receiver node data area in the
source node. (Note 2)
-
D2
Specify the device area in the source node to save the execution result
code (one word).
(Note 3)
(Note 1) Operand [S1] is specified by combining two hexadecimal digits of MODBUS function code with two
hexadecimal digits of partner station no.
E.g. Specify "H030F" when MODBUS function code is 03 (Read Holding Registers) and station no. is 15.
(Note 2) Based on the types of device specified in operand [D1], the transmission methods and MODBUS function
codes that can be used vary.
Device to be specified
for [D1]
Transmission
method
Values that can be specified in higher
bytes of [S1]
16 bit device
WX, WY, WR, WL, DT, LD
Register
transmission
H1: Read Coil Status (01)
H2: Read Input Status (02)
H3: Read Holding Registers (03)
H4: Read Input Registers (04)
1 bit device
X, Y, R, L, DT, n, LD, n
Bit transmission
H1: Read Coil Status (01)
H2: Read Input Status (02)
(Note 3) The No. of sent data is on a word basis for register transmission, and on a bit basis for bit transmission.
(Note 4): Devices that can be specified for [D2] are: WX, WY, WR, WL, DT, LD. Saved as one word in the specified
area.
0: Normal completion
1: Communication port is being used for master communication
2: Communication port is being used for slave communication
3: No. of master communication commands that can be used simultaneously has been exceeded
4: Sending timeout
5: Response reception timeout
6: Received data error
6-7