Pepper-computer Modular Computers RS485 Uživatelský manuál stáhnout pdf (Strana 155)

Digital Modules

08 Jan. 98

SMART I/O User’s Manual

Page 4 - 69Manual ID 09901, Rev. Index 0500

Logical Address

The 8 inputs of this module may be clearly seen together with

the logical address at which this particular board is residing.

Remember, this logical address is the same as the physical slot

position! In the example shown here, the board being addressed

is in slot 2 i.e. the second of the SMART-BASE slots. Up to 11

slots are catered for in the SMART I/O concept; 3 on the

SMART-BASE and 2 for each connected SMART-EXT (up to a

total of 4).

4.4.9.2 ISaGRAF Operate Calls

Operate calls are built into a program using ST or FBD lan-

guages 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 pos-

sesses its own set of such COMMANDS.

Example

<error.code>:= OPERATE(<channel>,

O_INIT_CODE, 0);

O_INIT_CODE is one of a number of distinct commands recog-

nized 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.

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