Connecting the MicroMaster 4 Drive

To make the connection to the MicroMaster Series 4 (MM4) drive, insert the ends of the RS-485 cable into the two caged clamp, screwless terminals provided for USS operation. The standard PROFIBUS cable and connectors can be used to connect the S7-200.

Caution

Interconnecting equipment with different reference potentials can cause unwanted currents to flow through the interconnecting cable.

These unwanted currents can cause communications errors or damage equipment. Be sure all equipment that you are about to connect with a communications cable either shares a common circuit reference or is isolated to prevent unwanted current flows.

The shield must be tied to chassis ground or pin 1 on the 9-pin connector. It is recommended that you tie wiring terminal 2--0V on the MicroMaster drive to chassis ground.

As shown in Figure 11-6, the two wires at the opposite end of the RS-485 cable must be inserted into the MM4 drive terminal blocks. To make the cable

connection on a MM4 drive, remove the drive cover(s) to access the terminal

blocks. See the MM4 user manual for details about how to remove the covers(s) of your specific drive.

The terminal block connections are labeled numerically. Using a PROFIBUS connector on the S7-200 side, connect the A terminal of the cable to the drive terminal 15 (for an MM420) or terminal 30 (MM440). Connect the B terminal of B (P) A (N)

the cable connector to terminal 14 (MM420) or terminal 29 (MM440).

Figure 11-6 Connecting to the MM420 Terminal Block

If the S7-200 is a terminating node in the network, or if the connection is point-to-point, it is necessary to use terminals A1 and B1 (not A2 and B2) of the connector since they allow the termination settings to be set (for example, with DP connector type 6ES7 972--0BA40--0X40).

Caution

Make sure the drive covers are replaced properly before supplying power to the unit.

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

You will also find a list ofparameters required to setup the drives in the same chapter.

Hope this helps,

Daniel Chartier

Hello

Just to say - cable must terminated and biased at both ends. In PLC's end, resistor on network connector must be switch "ON".

regards

Hello

Yes, looks fine.

regards