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. Magnesium Fluoride (MgF2) Windows offer excellent broadband transmission from the deep-UV to the mid-infrared.
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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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