Siemens SIMATIC S7-200 System Manual page 357

Cable must be terminated
and biased at both ends.
Switch position = On: Terminated and biased
B
TxD/RxD +
A
TxD/RxD -
Cable shield
Figure 11-5 Bias and Termination of the Network Cable
Setting Up the MicroMaster 3 Drive
Before you connect a drive to the S7-200, 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). Press the P key: P000 is displayed. Press the
up or down arrow key until the display shows the P944. Press P to enter the parameter.
P944=1
2. Enable the read/write access to all parameters. Press the P key. Press the up or down
arrow key until the display shows P009. Press P to enter the parameter.
P009=3
3. Check motor settings for your drive. The settings will vary according to the motor(s) being
used. Press the P key. Press the up or down arrow key until the display shows the motor
setting for your drive. Press P to enter the parameter.
P081=Nominal frequency of motor (Hz)
P082=Nominal speed of motor (RPM)
P083=Nominal current of motor (A)
P084=Nominal voltage of motor (V)
P085=Nominal power of motor (kW/HP)
4. Set the Local/Remote control mode. Press the P key. Press the up or down arrow key until
the display shows P910. Press P to enter the parameter.
P910=1 Remote control mode
Using the USS Protocol Library to Control a MicroMaster Drive
Switch position = On
Terminated and biased
On
A B A B
Bare shielding: approximately 12 mm (1/2 in.) must
contact the metal guides of all locations.
Pin #
6
390 Ω
3
Network
220 Ω
connector
8
390 Ω
5
1
Switch position = Off Switch position = On
No termination or bias Terminated and biased
Off
A B A B A B A B
Switch position = Off: No termination or bias
B
TxD/RxD +
A
TxD/RxD -
Cable shield
B
TxD/RxD +
A
TxD/RxD -
Cable shield
Chapter 11
On
Pin #
6
3
Network
connector
8
5
1
343