Diagnosis STO

The device monitors the correct operation with a internal plausibility check. Status bit SBM indicates the current status of the device and can be provided via fieldbus or a local digital output. A controller evaluate the status SBM.

If an error occurs, the pulses for controlling of the output stage are blocked.

Following states may occur:

Switch contact 24B and 0B interrupted → STO active

Controller enable	Description
0	SBM =1 - Regular operating state Safe pulse inhibitor No error messages
1	SBM = 0 Safe pulse inhibitor Error message 2320 'EF inactive'

Controller enable

Description

SBM =1 - Regular operating state

Safe pulse inhibitor

No error messages

SBM = 0

Safe pulse inhibitor

Error message 2320 'EF inactive'

Switch contacts closed → STO inactive

Controller enable	Description
0	SBM = 1 - Regular operating state Pulses enabled No error messages
1	SBM = 1 - Regular operating state QRF → PWM-control active

Controller enable

Description

SBM = 1 - Regular operating state

Pulses enabled

No error messages

SBM = 1 - Regular operating state

QRF → PWM-control active

Internal error → State is not plausible

Controller enable	Description
0	SBM = 0 Safe pulse inhibitor Error message 2361 'EF Logic'
1	SBM = 0 Safe pulse inhibitor Error message 2320 'EF inactive'

Controller enable

Description

SBM = 0

Safe pulse inhibitor

Error message 2361 'EF Logic'

SBM = 0

Safe pulse inhibitor

Error message 2320 'EF inactive'

A restart of the device or 'Clear Error' resets an error message. In error free state of the drive can be switched by a positive edge at RF in control.