When the S7-1200 uses the USS communication protocol to speed the MM440, the STEP7-Basic V10.5 software comes with the USS instruction library. Unlike the STEP7-Micro/WIN V4.0 software, an additional instruction library is required.
When the S7-1200 uses the USS communication protocol to speed the MM440, the STEP7-Basic V10.5 software comes with the USS instruction library. Unlike the STEP7-Micro/WIN V4.0 software, an additional instruction library is required.
USS protocol communication Each S7-1200 CPU can have up to 3 communication modules, and each CM1241 (RS485) communication module supports up to 16 inverters. Therefore, users can establish up to three USS networks in one S7-1200 CPU, and each USS network supports up to 16 inverters, for a total of up to 48 USS inverters.
Use a CPU1214C to perform USS stepless speed regulation on the MM440 inverter, change the parameter of P701 to 1, and read the P702 parameters. The technical parameters of the motor are known, the power is 0.06 kW, the rated speed is 1440 r/min, the rated voltage is 380 V, the rated current is 0.35 A, and the rated frequency is 50 Hz. Please propose a solution.
(1) Software and hardware configuration 11 sets of STEP7-Basic V10.5;
21 sets of MM440 inverters;
31 CPU1214C;
41 sets of CM1241 (RS485);
51 motors;
61 shielded twisted pairs.
The hardware configuration is shown in the figure.
(2) Setting of the inverter According to Table 3-12, setting the parameters of the inverter and setting the parameters of the inverter correctly are very important for USS communication.
Table 3-12 Inverter Parameter Table
Serial number | Inverter parameters | Factory default | Set value | Function Description |
1 | P0304 | 230 | 380 | Motor rated voltage (380V) |
2 | P0305 | 3.25 | 035 | Motor rated current (0.35A) |
3 | P0307 | 0 75 | 0.06 | Motor rated power (60W) |
4 | P0310 | 50 00 | 50.00 | Rated frequency of the motor (50Hz) |
5 | P0311 | 0 | 1440 | Rated speed of the motor (1430 r/min) |
6 | P0700 | 2 | 5 | Select command source (USS setting for COM link) |
7 | P1000 | 2 | 5 | Frequency source (USS setting of COM link) |
8 | P2010 | 6 | 6 | USS baud rate (6-9600) |
9 | P2011 | 0 | 1 | Site address |
10 | P2012 | 2 | 2 | USS PZD length |
11 | P2013 | 127 | 4 | USS PKW length |
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