Siemens SINAMICS G120 Instructions d'exploitation télécharger pdf (Page 142)

Configuring the fieldbus

6.2 Communication via RS485

Inverter with CU240B-2 and CU240E-2 Control Units

140 Operating Instructions, 01/2011, FW 4.4, A5E02299792B AB

6.2.3.4 Baud rates and mapping tables

Permissible baud rates and telegram delay

The Modbus RTU telegram requires a pause for the following cases:

● Start detection

● Between the individual frames

● End detection

Minimum duration: Processing time for 3.5 bytes (can be set via p2024[2]).

A character delay time is also permitted between the individual bytes of a frame. Maximum

duration: Processing time for 1.5 bytes (can be set via p2024[1]).

Table 6- 29 Baud rates, transmission times, and delays

Baud rate in bit/s (p2020) Transmission time per

character (11 bits)

Minimum pause

between two

telegrams (p2024[2])

Maximum pause

between two bytes

(p2024[1])

4800 2.292 ms ≥ 8.021 ms ≤ 3.438 ms

9600 1.146 ms ≥ 4.010 ms ≤ 1.719 ms

19200 (factory setting) 0.573 ms ≥ 1.75 ms ≤ 0.859 ms

38400 0.286 ms ≥ 1.75 ms ≤ 0.75 ms

57600 0.191 ms ≥ 1.75 ms ≤ 0.556 ms

76800 0.143 ms ≥ 1.75 ms ≤ 0.417 ms

93750 0.117 ms ≥ 1.75 ms ≤ 0.341 ms

115200 0.095 ms ≥ 1.75 ms ≤ 0.278 ms

187500 0.059 ms ≥ 1.75 ms ≤ 0.171 ms

Note

The factory setting for p2024[1] and p2024[2] is 0. The particular values are pre-assigned

depending on the protocol selection (p2030) or the baud rate.

Modbus register and Control Unit parameters

Since the Modbus protocol can only handle register or bit numbers for addressing the

memory, assignment to the appropriate control words, status words and parameters is

performed on the slave side.

The converter supports the following addressing ranges:

Addressing range Remark

40001 … 40065 Compatible with Micromaster MM436

40100 … 40522

1 2 ... 137 138 139 140 141 142 143 144 145 146 147 ... 303 304

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Siemens SINAMICS G120 Instructions d'exploitation Page 142