Output Management

Introduction

The M241 Logic Controller features both regular and fast transistor outputs (PTO / PWM / FreqGen).

The following output functions are configurable on the transistor outputs:

oAlarm output

oHSC (reflex features on HSC threshold)

oPTO

oPWM

oFreqGen

NOTE: All outputs can be used as regular outputs.

Output Management Availability

The following table shows the possible usage of the M241 Logic Controller digital outputs on references with transistor outputs:

Reference

Function

Alarm Output

HSC

FreqGen

PWM

PTO

TM241C•40T / TM241C•40U

TM241C••24T / TM241C••24U

Fast output

Q0

X

Reflex output 0 or 1

Output A

Output A

Output A or B

Q1

X

Reflex output 0 or 1

Output A

Output A

Output A or B

Q2

X

Reflex output 0 or 1

Output A

Output A

Output A or B

Q3

X

Reflex output 0 or 1

Output A

Output A

Output A or B

Regular output

Q4

X

Reflex output 0 or 1

Output A

Output A

Output A or B

Q5

X

Reflex output 0 or 1

Output A

Output A

Output A or B

Q6

X

Reflex output 0 or 1

Output A

Output A

Output A or B

Q7

X

Reflex output 0 or 1

Output A

Output A

Output A or B

Q8

X

–

–

–

–

Q9

X

–

–

–

–

 

Q10

X

–

–

–

–

Q11

X

–

–

–

–

Q12

X

–

–

–

–

Q13

X

–

–

–

–

Q14

X

–

–

–

–

Q15

X

–

–

–

–

The following table shows the possible usage of the M241 Logic Controller on references with relay outputs:

Reference

Function

Alarm Output

HSC

FreqGen

PWM

PTO

TM241C•40R

TM241C••24R

Fast output

Q0

X

Reflex output 0 or 1

Output A

Output A

Output A or B

Q1

X

Reflex output 0 or 1

Output A

Output A

Output A or B

Q2

X

Reflex output 0 or 1

Output A

Output A

Output A or B

Q3

X

Reflex output 0 or 1

Output A

Output A

Output A or B

Regular output

Q4

X

Reflex output 0 or 1

–

–

–

Q5

X

Reflex output 0 or 1

–

–

–

Q6

X

Reflex output 0 or 1

–

–

–

Q7

X

Reflex output 0 or 1

–

–

–

Q8

X

–

–

–

–

Q9

X

–

–

–

–

 

Q10

X

–

–

–

–

Q11

X

–

–

–

–

Q12

X

–

–

–

–

Q13

X

–

–

–

–

Q14

X

–

–

–

–

Q15

X

–

–

–

–

Fallback Modes (Behavior for Outputs in Stop)

When the controller enters the STOPPED or one of the exception states for any reason, the local (embedded and expansion) outputs are set to Default Value defined in the application.

In case of PTO outputs, the fallback values are forced to 0 logic (0 Vdc) and these values cannot be modified.

Short-circuit or Over-current on Source Transistor Outputs

Outputs are clustered in packs of 4 outputs maximum (less when the total number of outputs of the controller is not a multiple of 4):

oQ0...Q3

oQ4...Q7

oQ8...Q11

oQ12...Q15

When a short-circuit or overload is detected, the cluster of 4 outputs is set to 0. An automatic rearming is done periodically (about 1 s).

The following table describes the actions taken on short-circuits or overload of transistor outputs Q0 to Q3:

If...

then...

If you have short-circuit at 0 V on transistor outputs

Transistor outputs automatically go into over-current protection or thermal protection mode.

For more information, refer to transistor output wiring diagrams.

If you have short-circuit at 24 V on transistor outputs

Transistor outputs automatically go into over-current protection mode.

For more information, refer to transistor output wiring diagrams.

The following table describes the actions taken on short-circuits or overload of transistor outputs from Q4 to Q15:

If...

then...

If you have short-circuit at 0 V on transistor outputs

Transistor outputs automatically go into thermal protection mode.

For more information, refer to transistor output wiring diagrams.

If you have short-circuit at 24 V on transistor outputs

No action is taken and no error is detectable. A short-circuit or overvoltage over 24 V may result in equipment damage.

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_Color.gifWARNING

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.

NOTE: The automatic rearming feature can be inhibited. Refer to the Programming Guide of your controller for more information.

Short-circuit or Over-Current on Sink Transistor Outputs

Sink transistor outputs are not internally protected against overloads or short-circuits.

The following table describes the actions taken on overloads or short-circuits on sink transistor outputs from Q0 to Q3:

If...

then...

If you have short-circuit at 0 V on transistor outputs

Transistor outputs automatically go into over-current protection or thermal protection mode.

For more information, refer to transistor output wiring diagrams.

If you have short-circuit at 24 V on transistor outputs

Transistor outputs automatically go into over-current protection mode.

For more information, refer to transistor output wiring diagrams.

The following table describes the actions taken on overloads or short-circuits on sink transistor outputs from Q4 to Q15:

If...

then...

If you have short-circuit at 0 V on transistor outputs

no action is taken and no error is detectable. A short-circuit or undervoltage less than 0 V may result in equipment damage.

If you have short-circuit at 24 V on transistor outputs

Transistor outputs automatically go into thermal protection mode.

For more information, refer to transistor output wiring diagrams.

Short-circuit or Over-Current on Relay Outputs

Relay outputs are not internally protected against overloads or short-circuits.

The following table describes the actions taken on overloads or short-circuits on relay outputs:

If...

then...

If you have short-circuit or overload at 0 V or 24 V on relay outputs

No action is taken and no error is detectable.

For more information, refer to relay output wiring diagrams.

Relay outputs are electromechanical switches capable of carrying significant levels of current and voltage. All electromechanical devices have a limited operational life and must be installed so as to minimize the potential for unintended consequences.

Warning_Color.gifWARNING

INOPERABLE OUTPUTS

Use appropriate, external safety interlocks on outputs where personnel and/or equipment hazards exist.

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

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