Expert I/O Overview

Introduction

The controller base provides:

o2 embedded expert I/O modules (DM72F0 and DM72F1) with:

o5 fast inputs

o2 regular inputs

o2 fast outputs

o1 Controller Power Distribution Module (CPDM)

Each embedded expert I/O module (DM72F•) can support expert functions.

Embedded Expert I/O Configuration

To configure the expert I/Os, double-click the Expert node in the Devices tree.

This figure presents the configuration tab screenshot:

This table presents the function of the different parameters:

Parameter	Function
Run/Stop Input	Define one input to be used as Run/Stop input.
Alarm Output	Define one output to be used as alarm output.
Rearming Output Mode	Define the rearming output mode.

Run/Stop Input

This table presents the different states:

Input states	Result
State 0	Stops the controller and ignores external Run commands.
A rising edge	From the STOPPED state, initiates a start-up of an application in RUNNING state.
State 1	The application can be controlled by: oEcoStruxure Machine Expert (Run/Stop) othe application (Controller command) oa network command

Input states

Result

State 0

Stops the controller and ignores external Run commands.

A rising edge

From the STOPPED state, initiates a start-up of an application in RUNNING state.

State 1

The application can be controlled by:

oEcoStruxure Machine Expert (Run/Stop)

othe application (Controller command)

oa network command

NOTE: Run/Stop input is managed even if the option Update IO while in stop is not selected in the PLC settings tab.

Inputs assigned to configured expert functions can not be configured as Run/Stop.

For further details about controller states and states transitions, refer to Controller State Diagram.

WARNING

UNINTENDED MACHINE OR PROCESS START-UP

oVerify the state of security of your machine or process environment before applying power to the Run/Stop input.

oUse the Run/Stop input to help prevent the unintentional start-up from a remote location.

Failure to follow these instructions can result in death, serious injury, or equipment damage.

Alarm Output

This output is set logical 1 when the controller is in the RUNNING state and the application program is not stopped at a breakpoint.

Outputs assigned to configured expert functions can not be configured as the Alarm output.

NOTE:

The alarm output is set to 0 when:

oa task is stopped at a breakpoint, the alarm output signals that the controller has stopped executing the application.

oan error is detected on the expert I/O (power interruption, short-circuit detection).

Rearming Output Mode

Fast outputs of DM72F• modules are push/pull technology. In the case of an error detected (short-circuit or over temperature), the output is put in tri-state and the condition is signaled by status bit (DM72F• channel IB1.0) and PLC_R.i_wLocalIOStatus (refer to the Modicon M258 Logic Controller System Functions and Variables PLCSystem Library Guide).

Two behaviors are possible:

oAutomatic rearming: as soon as the detected error is corrected, the output is set again according to the current value assigned to it and the diagnostic value is reset.

oManual rearming: when an error is detected, the status is memorized and the output is forced to tri-state until user manually clears the status (see I/O mapping channel).

In the case of a short-circuit or current overload, the common group of outputs automatically enters into thermal protection mode (all outputs in the group are set to 0), and are then periodically rearmed (each second) to test the connection state. However, you must be aware of the effect of this rearming on the machine or process being controlled.

WARNING

UNINTENDED MACHINE START-UP

Inhibit the automatic rearming of outputs if this feature is an undesirable behavior for your machine or process.

Failure to follow these instructions can result in death, serious injury, or equipment damage.