APPENDICES
Appendix 6 Precautions for Using Serial Communication Module
App - 32
9
PROCESSING TIME
FOR REDUNDANT
SYSTEMS
APPENDICESINDEX
Appendix 6 Precautions for Using Serial Communication Module
The dedicated instructions of the serial communication module for the module mounted to
the extension base unit cannot be used in the redundant CPU system.
For the functions to communicate using the dedicated instructions, create programs by
using the FROM/TO instruction.
The dedicated instruction applicable in the serial communication module and the
changeability by the FROM/TO instruction are shown in Table.App 13.
* 1: Station number or operating status (independent/linked) cannot be changed.
A sample program of the serial communication module where dedicated instructions are
changed to the FROM/TO instruction is described in the next section or later.
For the precautions at system switching, refer to Section 7.4.
Table.App 13 Serial Communication Module Dedicated Instruction List
Instruction
name
Function overview
Changeability by
FROM/TO
instruction
Reference section
CSET
Sets initial setting of the unit (word/byte) of the number of send/receive
data and the send/receive area size.
Applicable Appendix 6.1
Performs PLC CPU monitoring registration/PLC monitoring cancel to use
the PLC CPU monitoring function.
N/A -
Clears receive data without stopping the send processing in the
nonprocedural protocol.
Applicable Appendix 6.1
UINI Switches mode, transmission specifications, and host station number.
Applicable
*1
Appendix 6.2
BUFRCVS
Receives data in the interrupt program by the nonprocedural or
bidirectional protocol communication.
N/A -
SPBUSY Reads send/receive status of data by dedicated instructions. N/A -
INPUT
Receives data by user arbitrary transmission format in the nonprocedural
protocol.
Applicable Appendix 6.3
PUTE Registers user registration frame. Applicable Appendix 6.4
GETE Reads user registration frame. Applicable Appendix 6.5
ONDEMAND Sends data by the on-demand function of MC protocol. Applicable Appendix 6.6
OUTPUT
Sends data as much as specified by the nonprocedural protocol
communication.
Applicable Appendix 6.7
PRR
Sends data by user registration frame according to specification at user
registration frame specification area for sending in the nonprocedural
protocol communication.
Applicable Appendix 6.8
BIDOUT
Sends data as much as specified by the bidirectional protocol
communication.
Applicable Appendix 6.9
BIDIN Reads data received by the bidirectional protocol communication. Applicable Appendix 6.10
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