Siemens SIMATIC ET 200S - Safety Concept; Figure 2-2 Design of a Positioning System with a Stepping Motor (Example)

1STEP 5V/204kHz
2.4 Safety concept
ET 200S Positioning
Operating Instructions, 05/2007, A5E00124871-04
23
2.4 Safety concept
Safety Measures
The following measures are imperative for the safety concept of the system. Install the items
carefully, and ensure they meet the system's requirements.
WARNING
To avoid injury and damage to property, make sure you adhere to the following:
• Install an emergency stop system in keeping with current technical standards
(for example, EN 60204, EN 418, etc.).
• Make sure that no one has access to areas of the system with moving parts.
• Install hardware limit switches for the end positions of the axes that switch off the power
control system directly.
• Install devices and take steps to protect motors and power electronics, as described for
example in the installation guidelines for the FM STEPDRIVE/SIMOSTEP.
Setting up a positioning control
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Figure 2-2 Design of a Positioning System with a Stepping Motor (Example)
The 1STEP 5V/204kHz generates the control frequency and the directional signal for the
power unit. The power unit processes the control signals and supplies the motor with power.
The motor is connected directly or by means of mechanical transmission elements to the
machine part that is to be moved.