Siemens SINAMICS S120 Handmatig - Pagina 13

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SINAMICS S120 Fail-Safe Drives

4.2.2

Principle connection between the F-CPU and TM54F

Connecting F-DO P/M switching (F-CPU) → F-DI (TM54F)

Load resistor dimensioning

If the manufacturer documentation contains specific conditions for the digi-

tal output, for example, a minimum load resp. a maximum load resistor,

these must be considered accordingly.

For example, a maximum load of 1kΩ is specified for SIMATIC ET200S I/O

module 4 F-D .

As a result, two additional 1 kΩ load resistors with a permanent load capac-

ity of at least P = U²/R = (28.8V)²/1 kΩ = 830 mW are required for connect-

ing such an F-DO to a TM54F F-DI.

Note: When using closed-loop controlled SITOP power supply units, the

voltage tolerance on the 24V side is significantly lower than the maximum

admissible tolerance of +20% for the supply voltage at the ET200S mod-

ules. In this case, the power transformed at the resistor is lower than the

maximum power calculated above.

I DT Safety Integrated

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Entry ID: 28424136

MC-FE-I-005-V11-EN