
Configuration and Use Manual
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Appendix E
Opcode Tables
E.1
About this appendix
This appendix defines opcode tables and describes the procedure for configuring them.
E.2
Opcode table overview
Opcode tables are used in ROC protocol to minimize the number of polls that a host program must
make to obtain the information that it requires.
Note: Opcode tables can be accessed only by host programs using ROC protocol for Model 3711
communications. Opcode tables cannot be accessed by host programs using Modbus protocol.
In a single request, a host program can address one or more contiguous memory locations. To address
non-contiguous memory locations, multiple requests are required. Opcode tables allow you to define
an overlay on memory locations, so that non-contiguous locations appear contiguous to the host
program, and can therefore be addressed in one request rather than many.
Configure the opcode tables to meet the requirements of specific host programs. Opcode tables should
be developed in conjunction with the host program.
The Model 3711 provides four separate opcode tables, and each opcode table can contain up to 44
memory locations. Each opcode table may be used by one or many Modbus communications
programs, and a host program can use as many opcode tables as desired.
E.3
Configuring opcode tables
To configure opcode tables:
1. Click
Configure > Opcode Table
. The dialog box shown in Figure E-1 is displayed.
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