User`s manual

(7) The following describes how the Q series C24 operates when the

programmable 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 (0H)

• Reading of monitoring data from the programmable controller CPU stops until the transmission of monitoring

data completes.

• 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 (0H)

• A transmission timeout error occurs, monitoring information read from the programmable controller CPU,

and transmission of monitoring information resumes.

• The error code is stored in the programmable controller CPU monitoring function error code storage area

(address: 2205H).

(8) When device data for the programmable controller CPU cannot be read

because 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.

(9) When the monitoring information is transmitted as data using the modem

function, 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.