Mitsubishi MELSEC L Series User Manual page 65

(7) The following describes how the Q series C24 operates when the programmable
(8) When device data for the programmable controller CPU cannot be read because
(9) When the monitoring information is transmitted as data using the modem function,
2 - 29
2 USING THE PROGRAMMABLE CONTROLLER CPU MONITORING FUNCTION
controller CPU monitoring result information cannot be sent to the external device
due to line disconnection or other reasons.
Even if an error occurs while the programmable controller CPU monitoring
function is in operation, the ERR LED does not light up. (This is the same as
when using the on-demand function of the MC protocol.)
(a) When the setting for the transmission monitoring time designation (timer 2) is
an infinite wait (0
H
1) Reading of monitoring data from the programmable controller CPU stops
until the transmission of monitoring data completes.
2) When transmission resumes, reading of monitoring data from the
programmable controller CPU resumes and monitoring data and
information are transmitted.
(b) When the setting for the transmission monitoring time designation (timer 2) is
other than an infinite wait (0
1) A transmission timeout error occurs, monitoring information read from the
programmable controller CPU, and transmission of monitoring information
resumes.
2) The error code is stored in the programmable controller CPU monitoring
function error code storage area (address: 2205
of a programmable controller CPU error (hardware failure, etc.), the error code is
stored in the programmable controller CPU monitoring function error code storage
area and the Q series C24 performs the monitoring processing based on
previously read data.
a modem connection error will occur if a modem connection is requested for the
following reasons.
• A connection request by Y11
• A notification-issued request by Y14
If possible, provide a dedicated Q series C24 for using the programmable
controller CPU monitoring function.
When using both the programmable controller CPU monitoring function and data
communication function with a single Q series C24 and one of the above modem
connection errors occurs, re-execute a connection request in consideration of the
transmission timing set by the user for the programmable controller CPU
monitoring function.
)
)
H
).
H
2 - 29