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Link Specifications - Mitsubishi Electric FX5 User Manual

Melsec iq-f series, ethernet communication.
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Link specifications

For applicable commands and devices, refer to Page 36 SLMP Commands.
Link time
■3E frames
Calculate the minimum processing time for transmission by SLMP with the following formula.
However, the processing time may further increase due to the network load (line congestion), window size of connected
devices, the number of simultaneously used connections, and the system configuration. Use the result of this formula as a
guideline value of the processing time, when only 1 connection is being used.
• Minimum processing time for communication by SLMP (for batch read, batch write)
Tfs=Ke+(KdtDf)+Scrnumber of scans required for processing+other device ACK processing time
Tfs: The time from when the personal computer receives the request data until the PLC finishes processing (unit: ms)
Ke, Kdt: Constants (refer to the table below)
Df: Number of words of requested data+Number of words of response data (application data portion)
Scr: Scan time
*1 The following shows the timing from when the personal computer receives the request data until the PLC finishes processing.
Target device
(personal computer)
Command message
0 step
PLC scan
time
Communication content
Batch read
Batch writing
Ex.
[Calculation example 1]
When performing TCP/IP communication with a personal computer and reading 32 points (devices) of data from the own
station's data register (D) as binary code data, using SLMP communication, the time from when the computer request data is
received until processing is finished (unit: ms)
Connected station scan time is 40 ms.
Tfs=1+(0.00132)+401+other device ACK processing time
[Calculation example 2]
When performing TCP/IP communication with a personal computer and writing 32 points (devices) of data to the own station's
data register (D) as binary code data, using SLMP communication, the time from when the computer request data is received
until processing is finished (unit: ms)
Connected station scan time is 40 ms.
Tfs=1+(0.00132)+401+other device ACK processing time
5 SLMP FUNCTION
34
5.1 Specifications
Response message
ACK
(Only TCP)
Tfs
When communicating as ASCII code data
When communicating as binary code data
When communicating as ASCII code data
When communicating as binary code data
ACK
(Only TCP)
0 step
END
For TCP/IP communication
Ke
Kdt
1
0.001
1
0.001
1
0.001
1
0.001
*1
END
For UDP/IP communication
Ke
Kdt
1
0.001
1
0.001
1
0.001
1
0.001

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