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Function Safe Torque Off ("STO")
The STO function serves to safely interrupt the energy supply to the motor directly at the drive.
The safety function STO can be operated:
- from a safety switch gear (safety relay for example) or
- from an external safety control or
- from the built-in safety card S1-2 or S2-2 (from HWR 2.10).
S701x2...S724x2
| S701x2...S724x2, Single channel STO, SIL2 / PLd | |
|---|---|
 |
Both switch off paths STO1-Enable and STO2-Enable are switched from one single output of a safety switchgear (e.g. a safety relay). Drives with a hanging load must have an additional safe mechanical blocking (e.g. by a motor holding brake). Thus, the circuit concept to realize the safety function "Safe Torque Off" within the servo amplifiers of the product line S700 is fit to satisfy the demands to
|
| S701x2...S724x2, Dual channel STO, SIL2 / PLd | |
|---|---|
 |
The two switch off paths STO1-Enable and STO2-Enable are switched separately from two outputs of a safety switchgear (e.g. a safety relays). Drives with a hanging load must have an additional safe mechanical blocking (e.g. by an external brake). Thus, the circuit concept to realize the safety function "Safe Torque Off" within the servo amplifiers of the product line S700 is fit to satisfy the demands to
|
| S701x2...S724x2, Dual channel STO, SIL3 / PLe | |
|---|---|
 Test of the output stage locking  |
Available from Firmware version 5.18. The two switch off paths STO1-Enable and STO2-Enable are switched separately from two outputs of a safety control. To reach PLe or SIL3 the safe locking of the output stage must be tested periodically by supervising the status feedback signal. The feedback signal "STO-STATUS" must be linked to one of the digital outputs DIGITAL-OUTx (X3A/6 or X3A/7) by setting the ASCII parameter OxMODE70. The dual channel concept with feedback of this function which is standard in the S700 from HWR 2.10 is certified by the TÜV (TÜV Certificate). Drives with a hanging load must have an additional safe mechanical blocking (e.g. by an external brake). Thus, the circuit concept to realize the safety function "Safe Torque Off" within the servo amplifiers of the product line S700 is fit to satisfy the demands to
|
S748x2...S772x2
| S748x2...S772x2, Single channel STO, SIL2 / PLd | |
|---|---|
 |
Both switch off paths STO1-Enable and STO2-Enable are switched from one single output of a safety switchgear (e.g. a safety relay). Drives with a hanging load must have an additional safe mechanical blocking (e.g. by a motor holding brake). Thus, the circuit concept to realize the safety function "Safe Torque Off" within the servo amplifiers of the product line S700 is fit to satisfy the demands to
|
| S748x2...S772x2, Dual channel STO, SIL2 / PLd | |
|---|---|
 |
The two switch off paths STO1-Enable and STO2-Enable are switched separately from two outputs of a safety switchgear (e.g. a safety relays). Drives with a hanging load must have an additional safe mechanical blocking (e.g. by an external brake). Thus, the circuit concept to realize the safety function "Safe Torque Off" within the servo amplifiers of the product line S700 is fit to satisfy the demands to
|
| S748x2...S772x2, Dual channel STO, SIL3 / PLe | |
|---|---|
 Test of the output stage locking  |
The two switch off paths STO1-Enable and STO2-Enable are switched separately from two outputs of a safety control. To reach PLe or SIL3 the safe locking of the output stage must be tested periodicaly by supervising the status feedback signals. The dual channel concept with feedback of this function which is standard in the S700 from HWR 2.10 is certified by the TÜV (TÜV Certificate). Drives with a hanging load must have an additional safe mechanical blocking (e.g. by an external brake). Thus, the circuit concept to realize the safety function "Safe Torque Off" within the servo amplifiers of the product line S700 is fit to satisfy the demands to
|
Safety Expansion Cards
Several important safety functions can be realized with expansion cards. These cards (manufacturer PILZ) can be inserted to slot 3 of the S700 (from HWR 2.10) and are configured via a special software SafetyGUI, available from the Downloads page.
The safety concept of these expansion cards, optionally built-in S700 from HWR 2.10 is certified by the TÜV (see TÜV Certificate).
- Expansion card Safety-S2-2 allows SIL 2 / PLd for SS1, SS2, SOS, SLS, SLI, SSR, SDI.
- Expansion card Safety-S1-2 allows SIL 3 / PLe for SS1, SS2, SOS, SLS, SLI, SLP, SSR, SDI, SBC, SBT.
Application notes
- S700 Safety: Safely limited speed
- S700 Safety: Safety door supervision
- S700 Safety: Several S700 on one safety control
Further Information
- Safety Characteristic Data
- Sistema, safety evaluation tool by IFA
- Tools
