User`s manual
44
2.2.5 Transmission methods of monitoring results and
transmission data to the external device
The following explain the method of transmitting the programmable controller CPU monitoring results and data to the
external device.
(1) Data transmission to the external device while performing communication
using the MC protocol
(a) The same format as for the messages sent with the on-demand function is used to
transmit data, except that the on-demand data section is replaced with the device
information and programmable controller CPU status information. The data is sent
as explained in Page 44, Section 2.2.5 (1) (c) and Page 45, Section 2.2.5 (1) (d). (
MELSEC Communication Protocol Reference Manual)
When the interface that is to use the modem function is set in the MC protocol, connection processing and
disconnection processing to the modem are performed when the programmable controller CPU monitoring
results are transmitted.
Data transmission by MC protocol with modem function (condition agreement transmission)
(b) When the transmission of on-demand data using user frames is designated, the
same format as for sending on-demand data using user frames is used to transmit
data, except that the on-demand data section is replaced with the device information
and programmable controller CPU status information. The data is sent as explained
in Page 44, Section 2.2.5 (1) (c) and Page 45, Section 2.2.5 (1) (d) below.
See the following explanatory items for data reception by the external device side.
• Device information, programmable controller CPU status information arrangement: MELSEC
Communication Protocol Reference Manual
• Arrangement of data in the user frame section to be sent: Page 243, CHAPTER 10
(c) When sending the monitoring results as data during constant cycle transmission,
the entire block portion of the monitoring target device information and
programmable controller CPU status information is transmitted in batch mode.
END ENDEND
External device
Matched
Dial
Discon-
nection
Cycle time
Sequence program
(conditions matched/
not match)
Not matched Matched
Registration information
for programmable controller
CPU monitoring