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CHAPTER 14 DATA COMMUNICATIONS USING EXTERNAL DEVICE AND PROGRAMMABLE CONTROLLER CPU M : N
CONFIGURATION
14
14.1 Data Communications Precautions
(3) The data transmitted by one external device is received by all the other
external devices, including the external device that transmitted the data. The
send data from a programmable controller CPU is also received by all the
external devices.
Therefore, it may be necessary for devices that received data not addressed to them (judged by station No. in the
message) to ignore the receive data.
At the programmable controller CPU, Q series C24 also ignores the receive data other than that addressed to it.
(4) Connect to multiple external devices and connect the terminating resistor as
described in User's Manual (Basic).
(5) When communicating data by using an m: n system configuration, designate
the following station number at the [Station No.] and [Local station No.] items
in the command message to be transmitted from an external device.
(a) When accessing the programmable controller CPU
(b) When accessing another external device (interlock communications)
*1 A station No. within the [0] to [31] (00H to 1FH) range not set to the Q series C24 on the programmable controller CPU
side is used as the external device No. in the [Station No.] and [Local station No.] items in the message.
Select and designate the No. of each external device.
The designation method is described in ( MELSEC Communication Protocol Reference Manual).
Station No.: Designates the No. of the transmit destination external device.
Local station No.: Designates the No. of the transmit source external device. (Does not have to be designated when A
compatible 1C frame is used.)
Item Communications using QnA compatible 2C/3C/4C frame Communications using A compatible 1C frame
Station No. Station No. of Q series C24 to be passed through ( MELSEC Communication Protocol Reference Manual)
Local station No.
Station No. of access source external device
*1
Designation unnecessary (No [Local station No.] item)
Item Communications using QnA compatible 2C/3C/4C frame Communications using A compatible 1C frame
Station No.
Station No. of access destination external device
*1
Local station No.
Station No. of access source external device
*1
Designation unnecessary (No [Local station No.] item)