Siemens SIMATIC S7-1200 System Manual page 1164

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Communication processor and Modbus TCP

13.4 Universal serial interface (USS) communication

If the drive is configured as the terminating

node in the network, then termination and

bias resistors must also be wired to the

appropriate terminal connections. This

diagram shows examples of the MM4 drive

connections necessary for termination and

Setting up the MM4 drive

Before you connect a drive to the S7-1200, you must ensure that the drive has the following

system parameters. Use the keypad on the drive to set the parameters:

1. Reset the drive to factory settings (optional).

If you skip step 1, then ensure that these parameters are set to the indicated

2. Enable the read/write access to all parameters (Expert mode).

3. Check the motor settings for your drive. The settings will vary according to

the motor(s) being used.

To set the parameters P304, P305, P307, P310, and P311, you must first set

parameter P010 to 1 (quick commissioning mode). When you are finished

setting the parameters, set parameter P010 to 0. Parameters P304, P305,

P307, P310, and P311 can only be changed in the quick commissioning

4. Set the local/remote control mode.

5. Set selection of frequency set-point to USS on COM link.

6. Ramp up time (optional)

This is the time in seconds that it takes the motor to accelerate to maximum

7. Ramp down time (optional)

This the time in seconds that it takes the motor to decelerate to a complete

8. Set the serial link reference frequency:

9. Set the USS normalization:

USS PZD length = P2012 Index 0=(2, 4, 6,

USS PKW length = P2013 Index 0=4

P0304 = Rated motor voltage (V)

P0305 = Rated motor current (A)

P0307 = Rated motor power (W)

P0310 = Rated motor frequency (Hz)

P0311 = Rated motor speed

P0700 Index 0=5

P1000 Index 0=5

P1120=(0 to 650.00)

P1121=(0 to 650.00)

P2000=(1 to 650 Hz)

P2009 Index 0=0

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK

Siemens SIMATIC S7-1200 System Manual page 1164

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