Transmission Methods Of Monitoring Results And Data Transmitted To The Target Device - Mitsubishi Electric MELSEC iQ-R Series User Manual

Transmission methods of monitoring results and data
transmitted to the target device
This section explains the transmission method of the CPU module monitoring results and the data to be transmitted to the
target device.
Data transmission to target device communicating with MC protocol
Data is transmitted in the same format as that for a message transmitted with the on-demand function with the on-demand
data portion replaced with the device information and programmable controller CPU status information, as explained in "When
sending the monitoring results as data during fixed cycle send" or "When sending the monitoring results as data during
condition match send" below. (MELSEC Communication Protocol Reference Manual)
■When the interface that uses the modem function is set to the MC protocol
The connection processing and disconnection processing to the modem are performed when the programmable controller
CPU monitoring results are transmitted.
Ex.
Data transmission by MC protocol with modem function (condition match send)
Cycle time
Program
(conditions matched/not match)
■When the transmission of on-demand data using user frames is designated
Data is transmitted in the transmission format for on-demand data using a user frame with the on-demand data portion
replaced with the device information and programmable controller CPU status information, as explained in "When sending the
monitoring results as data during fixed cycle send" and "When sending the monitoring results as data during condition match
send" below.
See the following explanation for data reception for the target device side.
• Device information, programmable controller CPU status information arrangement ( MELSEC Communication Protocol
Reference Manual)
• Arrangement of data in the user frame portion to be transmitted (Page 267 ON-DEMAND DATA COMMUNICATIONS
USING USER FRAMES)
■When transmitting the monitoring results as data during fixed cycle send
Data equivalent to the entire blocks of the monitoring target device information and programmable controller CPU status
information is transmitted in batch.
■When transmitting the monitoring results as data during condition match send
The device information for a block which the monitoring conditions are matched and the programmable controller CPU status
information at an occurrence of an error are transmitted with the head data (header) and last data (footer) for the on-demand
function added for each block.
Transmission is performed in the order of the programmable controller CPU status information, the device information
registered in the word block, and then the device information registered in the bit block.
When data is communicated using the MC protocol format 1 to 4, all of the device monitoring start device
number is converted to hexadecimal ASCII data and transmitted. (The same conversion is performed during
either fixed cycle send or condition match send.)
Registration information for
Dial
programmable controller CPU monitoring
END END
Matched Not matched
6 USING THE PROGRAMMABLE CONTROLLER CPU MONITORING FUNCTION
Disconnection
END
Matched
6.2 Programmable Controller CPU Monitoring Function
6
Target device
127