Siemens SIMATIC S5-95F, Manual

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Application S5-95F
17.2 Process Description
Figure 17-1 shows the process mimic of a simplified hydraulic lifting device. The description of the
hydraulic lifting device follows below:
The hydraulic stamp starts to move
• When the stamp is at top dead center
and
• Momentary-contact start switches S1 and S2 are pressed within 0.5 s. This condition must be
fulfilled in order to ensure that the operator is outside the danger area during the process.
The following process executes cyclically as long as S1 and S2 are actuated:
1. The "Lower" command is set and the stamp is lowered.
2. When the stamp reaches momentary-contact limit switch S3, the "Lower" command is reset.
3. The "Raise" command is set and the stamp is raised.
4. When the stamp reaches momentary-contact limit switch S4 (home position), the "Raise"
command is reset. The cycle is complete.
Movement is stopped
• When the STOP switch is actuated
• When the operator releases one of the two start switches during the cycle
• When momentary-contact limit switch S4 reaches the "Stamp raised" position
To restart the process, the two start switches must once again be pressed within 0.5 s.
Process Mimic
Figure 17-1. Process Mimic of a Hydraulic Lifting Device
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Lower (Q 32.0)
Lower Raise
S4 (I 32.3)
S3 (I 32.2)
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Raise (Q 32.1)
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Reset (I33.0)
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STOP (I32.4)
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17-2
EWA 4NEB 812 6210-02