Pepper-computer Modular Computers RS485 Bedienungsanleitung PDF herunterladen (Seite 105)

SMART I/O User’s Manual

Chapter 4 Digital Modules

4.1.9.2 The ISaGRAF Operate Calls

Operate calls are built into a program using ST or FBD languages when

defining the project. A typical use could be at the initialization stage to

check that the SMART-Modules are in fact located where they have been

programmed to be. The syntax of the operate call is as follows:

Syntax

<return variable> := OPERATE(<source var>, COMMAND,

<source data>);

Here the return variable is assigned a value associated with the

selected COMMAND parameter. Each SMART-Module possesses its own set

of these COMMANDS.

Example

<error.code>:= OPERATE(<channel>, O_INIT_CODE, 0);

O_INIT_CODE is one of a number of distinct commands recognized by the

PEP Modular Computers’ implementation of board drivers and checks for

example that the board is located where the program expects it to be.

channel provides channel specific information and in the example shown

here, any of the 8 input channels may be used. The last parameter is not

usually used by PEP implementations and is set to 0 (zero).

The error.code returns a value of zero if no error was detected, other-

wise it returns a non-zero value depending on the error encountered. A list of

these error codes may be found in the PEP online help.

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Pepper-computer Modular Computers RS485 Bedienungsanleitung Seite 105