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APPENDICES APPENDIX
Appendix 4 Dedicated Instructions
Appendix 4 Dedicated Instructions
Dedicated instructions are used to simplify programming when using intelligent function module functions.
For details, refer to the following manual.
MELSEC iQ-R Programming Manual (Instructions, Standard Functions/Function Blocks)
Dedicated instruction list
List of dedicated instruction
The following table lists the dedicated instructions explained.
*1 To change the following setting values of the buffer memory used by the dedicated instructions, use Engineering tool or execute the
CSET instruction (initial setting) before starting data communication. (MELSEC iQ-R Programming Manual (Instructions, Standard
Functions/Function Blocks)))
'Word/byte units designation' (Un\G150/310)
'Buffer memory start address designation' (Un\G160/321)
'Send buffer memory start address designation' (Un\G162/322)
'Send buffer memory length designation' (Un\G163/323)
'Receiving buffer memory start address designation' (Un\G166/326)
'Receive buffer memory length designation' (Un\G167/327)
The dedicated instructions are executed base on the setting values of the buffer memory at the module startup or those which were
changed by the CSET instruction (initial setting).
Do not change data (control data, request data, etc.) designated by a dedicated instruction until the execution of that
instruction is completed.
Purpose Dedicated
instruction
Function overview
On-demand function
transmission
ONDEMAND
*1
Sends data using the on-demand function of MC protocol.
Predefined protocol function CPRTCL Executes the protocol setting data registered using the Predefined protocol support function of
Engineering tool.
Nonprocedural protocol
communication
OUTPUT
*1
Transmits data for the designated data count.
INPUT
*1
Reads received data.
Bidirectional protocol
communication
BIDOUT
*1
Transmits data for the designated data count.
BIDIN
*1
Reads received data.
Communication status
confirmation
SPBUSY Reads the status of data transmission/reception using the dedicated instruction.
Data transmission/reception BUFRCVS
*1
Receives data by an interrupt program using nonprocedural or bidirectional protocol communication.
PRR
*1
Transmits data with the user frame according to the contents defined in the send user frame designation
area in data communications using the nonprocedural protocol.
Receive data clear CSET Performs the receive data clear without stopping the transmission processing in data communications
using the nonprocedural protocol.
Programmable controller CPU
monitoring function
Registers/cancels programmable controller CPU monitoring in order to use the programmable controller
CPU monitoring functions.
Setting the units of send/receive
data quantity
Sets the unit (word/byte) of data quantity to be sent and received.
User frame registration to flash
ROM (registration/reading of
user frame)
PUTE Registers a user frame.
GETE Reads a user frame.
Mode switching UINI Changes the mode, transmission specifications, and host station No. of C24.
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