User`s manual

21
MANUAL'S USE AND STRUCTURE
(1) How to use this manual
This manual describes the use of special functions for the Q series C24 (QJ71C24N, QJ71C24N-R2, QJ71C24N-
R4, QJ71C24, QJ71C24-R2), with each chapter covering a specific function.
Please read this manual and use the contents below as a reference.
(a) To read an overview of special functions
An overview of the major special functions is described in Chapter 1.
(b) To use the function that monitors errors in the programmable controller CPU
• Chapter 2 describes the programmable controller CPU monitoring function, which monitors the
programmable controller CPU status and devices and automatically sends status information to the other
communicating device upon occurrence of an error.
• For how to register/cancel the programmable controller CPU monitoring from the external device using the
MC protocol, refer to the MELSEC Communication Protocol Reference Manual.
(c) To use the data communication function for the exchange of data with an external
device at a remote location
Chapter 3 describes the specifications, procedures and other items regarding communication using the modem
function in order to exchange of data with an external device at a remote location.
(d) To use the function for reading received data from the external device using an
interrupt program in order to reduce the scan time
Chapter 4 describes the programming for execution of a receiving program only when data from the external
device is received.
(e) To use the function for monitoring the data communication time with the external
device
Chapter 6 describes the function that monitors the data communication time with the external device, along
with the reception-interval time and the response-reception time for transmission.
(f) To use the transmission control function to control data transmission/reception with
the external device
Chapter 7 describes the DTR/DSR control and the DC code function to control the data communication with the
external device.
(g) To use the function for simplifying the data communication program with the
registration data when preregistering the fixed-format section of the communication
message
Chapters 9 to 11 describe the data transmission/reception function with user frames in which the fixed-format
section of the communication message has been preregistered.