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Asked:18 Oct 2025

SIMATIC S5 / STEP 5: Dp slave S5 95U

Dear sir,
i want to cennect a s5 95u as DP slave to s7400, but i don't know how to config 95u and s7400,
can u help me ?
Best Regards
light

#sosflex #SIMATIC S5 / STEP 5 #siemens
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Siemens Test Added an Answer on18 Oct 2025

Connecting S5-95U as DP Slave to S7-400

Dear Light,

Connecting an S5-95U as a DP slave to an S7-400 requires configuration on both PLCs. Here's a breakdown of the key steps:

S5-95U Configuration:

  • Install a CP 56FA-2: This communication processor is necessary for DP slave functionality.
  • Configure the CP: Using the S5 programming software, configure the CP 56FA-2 with a unique DP slave address.
  • Define DP Inputs/Outputs: Map the S5's I/O to the DP interface, specifying data types and sizes.

S7-400 Configuration:

  • Install a DP Master CP: Like CP 443-1.
  • Configure the DP Master: In the S7-400's hardware configuration, add and configure the DP master CP.
  • Add the S5-95U as a DP Slave: Define the S5-95U as a DP slave, specifying its DP address (matching the S5 configuration).
  • Define Data Exchange: Configure the data exchange between the S7-400 and S5-95U, mapping S7-400 memory areas to the S5's DP I/O.

For detailed instructions and examples, please refer to these resources:

Best Regards,
Siemens Self Support

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