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maersk
Member 3
Joined: 17 Aug 2014
Posts: 891
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 Posted: 22/07/2015 18:53 Post subject: Emergency stop up to SIL 3 fail-safe S7-1500 |
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Emergency stop up to SIL 3 / PL e with a fail-safe S7-1500 controller
https://support.industry.siemens.com/cs/document/21064024/emergency-stop-up-to-sil-3-pl-e-with-a-fail-safe-s7-1500-controller-
In order to be able to securely switch of a machine even in an emergency situation, an emergency stop
control device is installed and monitored by the same controller that also controls the automation process. The actuators will be controlled via two contactors. The safety function has to be designed up to SIL 3 in accordance with IEC 62061 or PL e in accordance with ISO 13849-1.
The inputs and outputs are read in and output by the distributed I/O ET 200SP. The controller and the distributed I/O communicate via the fail-safe PROFINET profile PROFIsafe.
In order to achieve the demanded safety level, the emergency stop is designed with two channels and monitored for discrepancy and cross-circuit by the controller.
The actuators are also set up redundantly, so in case one contactor fails (e.g. welding of the contacts) the machine is still safely switched off by the second contactor.
The safety function example is assessed with the SET (Safety Evaluation Tool) according to IEC 62061 and ISO 13849-1.
https://support.industry.siemens.com/cs/attachments/21064024/21064024_E-Stop_SIL3_1500F_DOC_V40_en.pdf
https://support.industry.siemens.com/cs/attachments/21064024/21064024_E-Stop_SIL3_1500F_CODE_V40.zip
https://support.industry.siemens.com/cs/attachments/21064024/21064024_E-Stop_SIL3_1500F_SET_V40.zip |
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maersk
Member 3
Joined: 17 Aug 2014
Posts: 891
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| Posted: 03/02/2017 12:21 Post subject: Monitoring the feedback circuit in the safety program |
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Monitoring the feedback circuit in the safety program
https://support.industry.siemens.com/cs/document/21331098/monitoring-the-feedback-circuit-in-the-safety-program
A machine executing dangerous movements is controlled via a fail-safe controller and switched by means of contactors. The correct functioning of the contactors shall be monitored in order to ensure a high diagnostic coverage and, thus, a high SIL or PL.
Monitoring the actuators represents a diagnostic function and significantly contributes to the SILCL (SIL claim limit) or PL of the corresponding subsystem. For electromechanical components (e. g. relays or contactors), a positively driven auxiliary contact often is fed back to the controller and then evaluated. This process is referred to as monitoring of the feedback circuit or readback of the contactors.
Figure 1 Typical wiring of an actuator and its feedback circuit
This is particularly required for a redundant setup. If one of the two contactors welds (without this being noticed), the two-channel system would become a single-channel system. Instead, the welding will be detected and it will be prevented that the system is switched on again until the error is eliminated.
In this application example, two machine parts are switched separately in order to illustrate the monitoring of the feedback circuit. Only the affected machine part shall be switched off via the local emergency-stop control devices. By means of the global emergency-stop control device, both machine parts are switched off safely.
Figure 2 Overview of the main components
Both contactors of a machine part are controlled in parallel via a failsafe output of the ET 200SP. The auxiliary contacts of both contactors of a machine part are connected in series and fed back to a DI of the ET 200SP. In the safety program, the signal of the feedback circuit is compared to the control signal of the contactors.
Example project for TIA Portal V13 SP1 (23,0 MB)
https://support.industry.siemens.com/cs/attachments/21331098/21331098_Feedback_DOC_V31_en.pdf
https://support.industry.siemens.com/cs/attachments/21331098/21331098_Feedback_PROJ_V30.zip
https://support.industry.siemens.com/cs/attachments/21331098/21331098_Feedback_SET_V20.zip |
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maersk
Member 3
Joined: 17 Aug 2014
Posts: 891
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| Posted: 19/05/2017 17:05 Post subject: Emergency stop up to SIL 3 / PL e with a fail-safe S7-1500 c |
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Emergency stop up to SIL 3 / PL e with a fail-safe S7-1500 controller
Project for TIA Portal V14
https://support.industry.siemens.com/cs/attachments/21064024/21064024_E-Stop_SIL3_1500F_DOC_V50_en.pdf
https://support.industry.siemens.com/cs/attachments/21064024/21064024_E-Stop_SIL3_1500F_PROJ_V50.zip
https://support.industry.siemens.com/cs/attachments/21064024/21064024_E-Stop_SIL3_1500F_SET_V50.zip
Archive
Version 4.0 with distributed I/O system
https://support.industry.siemens.com/cs/attachments/21064024/21064024_E-Stop_SIL3_1500F_DOC_V40_en.pdf
https://support.industry.siemens.com/cs/attachments/21064024/21064024_E-Stop_SIL3_1500F_CODE_V40.zip
https://support.industry.siemens.com/cs/attachments/21064024/21064024_E-Stop_SIL3_1500F_SET_V40.zip |
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