Siemens 9350, 9300, 9330 manual ION Modules, Module Linking Restrictions

Basics of ION Architecture 9300 Series User’s Guide

ION Modules

The ION module is the basic building block of the ACCESS device’s operating software. A module can be considered as a “function box”: it receives data from its inputs, makes decisions based on the settings in its setup registers, and then makes data available at its output registers. All functionality provided by an ACCESS device can be considered in terms of its modules and the linkages between them.

INPUT REGISTERS

are connected to the output registers of other modules; data flows into them.

ION Module
	Output 1
Input 1
Input 2	Output 2

SETUP REGISTERS control how the module processes data

OUTPUT REGISTERS hold the result of the module’s operation– this data is available to other ION modules.

Modules are linked together to create powerful functions. For example, the framework below consists of four modules that, when combined, trigger a waveform recording in response to an over-voltage condition.

Power Meter

Module

Vln a

Setpoint Module

Trigger

One-Shot Timer

Module

Trigger

Waveform Recorder

Module

Waveform log

Voltage on phase A	Setpoint goes ON when	One-Shot Timer waits for	Waveform is recorded
is measured	Vln a exceeds a limit and	a specified period then	and stored in the log file
	outputs a trigger pulse	outputs a trigger pulse

Module Linking Restrictions

The maximum number of modules that can be linked in a row is 25. This is referred to as the framework’s depth. Modules that branch off or branch into the chain do not affect the depth, and there is no restriction on the number of branches you can have in a framework.

Another restriction concerns “circular” linking of modules. You cannot link a module’s output register to its own input or to the input of any module that precedes it in the chain. This protects you from creating infinite loops that can waste system resources.

The one exception to this rule is the Feedback module, which makes circular linkages possible (refer to the ION Programmer’s Reference).

Page 84 Chapter 4 - Using ACCESS Software