Mitsubishi MELSEC L Series User Manual page 46

(2) Data transmission to the external device while performing
Cycle time
Sequence program
(conditions matched/
not matched)
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2 USING THE PROGRAMMABLE CONTROLLER CPU MONITORING FUNCTION
(d) When sending the monitoring results as data during condition agreement
transmission, head data (header) and end data (footer) for the on-demand
function are added to the device information for a block with matched
monitoring conditions and the programmable controller CPU status
information upon the occurrence of an error. The header and footer are
added to each clock, and then the monitoring result data is transmitted.
Transmission is performed in the following order: the programmable
controller CPU status information, then the device information registered
in the word block, and then the device information registered in the bit
block.
POINT
When there is communication using the MC protocol form 1) to 4), all of the device
monitoring head device number will be converted to hexadecimal ASCII data and
sent. (The same conversion is performed during either constant cycle transmission
or condition agreement transmission.)
communication using the non procedure protocol
(a) The device information and CPU information are sent by the word/byte unit
designations.
When the communication data ASCII-BIN conversion is designated, it is
converted to ASCII code data and sent. (Examples are shown in (f)).
1) When the word/byte unit designation is word unit, the device information
and CPU information are each sent in one-word segments in a (H) (L)
sequence.
2) When the word/byte unit designation is byte, the device information and
CPU information are each sent in one-word segments in a (L) (H)
sequence.
When the interface that is to use the modem function is set in the non
procedure protocol, connection processing and disconnection processing
to the modem are performed when the programmable controller CPU
monitoring results are transmitted.
(Example) Data transmission by non procedure protocol with modem function
(condition agreement transmission)
Dial 1 block
END
Matched
(b) When sending monitoring results as data during constant cycle transmission,
the device information of two or more user frame No. and programmable
controller CPU status information that have been currently designated for the
constant cycle transmission by the Q series C24.
Monitoring information
1 block
•••
END
Not matched
Discon-
nection
END
Matched
External device
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