Communication
Page 7-6
ABB Control - AC 31
1SBC 260400 R1001-b
06.99
1.3. Programming
1.3.1. MODBUS slave unit
All the data may be read or written in MODBUS .
A program
isn’t required for MODBUS
communication management. The MODBUS slave central unit automatically converts the
request sent by the master MODBUS and returns a message once it has recognized the
address.
The SINIT function is only required in the program when changing communication parameters.
1.3.2. MODBUS master unit
The
MODBUS
function
enables sending data read / write requests to MODBUS
slaves
A change of communication parameters also requires the usage of the SINIT function in the
program.
1.3.3. List of cross references
An exchange of MODBUS data is realized in a table defined by:
- The MODBUS address of the first exchanged variable
- The list size = the total number of variables in the list.
All the variables of the 40 and 50 series central units, as described in the following table, can
be read or written by the master MODBUS .
- MODBUS
addressing method :
VAR 00.00 ADDR 0
(VAR = type I,O,S,M,IW,OW,MW,KW)
(Address of the first selected variable in
decimal)
VAR XX.YY = ADDR 0 + ( 16 * XX ) + YY
(VAR = type MD,KD)
(Address of the first selected variable in decimal)
VAR XX.YY = ADDR 0 + ( 32 * XX ) + ( 2 * YY )
Example : Find the MODBUS
address of variables O62.15 and M232.01 and MD002.07
O 62.15 = 4096 + ( 16 * 62 ) + 15 =
5103
M 232.01 = 8192 + ( 16 * 232 ) + 1 =
11905
MD002.07 = 4000 + ( 32 * 2 ) + ( 2 * 7 ) =
16462
Содержание AC 31
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Страница 84: ...AC 31 technical documentation ABB Control AC 31 Page 4 1 1SBC 260400 R1001 b 06 99 Chapter 4 Installation ...
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Страница 110: ...AC 31 technical documentation ABB Control AC 31 Page 5 1 1SBC 260400 R1001 b 06 99 Chapter 5 Programming ...
Страница 130: ...Programming ABB Control AC 31 Page 5 21 1SBC 260400 R1001 b 06 99 ...
Страница 141: ...Programming Page 5 32 ABB Control AC 31 1SBC 260400 R1001 b 06 99 Figure 5 10 Duplicating inputs of a function block ...
Страница 154: ...AC 31 technical documentation ABB Control AC 31 Page 6 1 1SBC 260400 R1001 b 06 99 Chapter 6 Program Optimization ...
Страница 172: ...AC 31 technical documentation ABB Control AC 31 Page 7 1 1SBC 260400 R1001 b 06 99 Chapter 7 Communication ...
Страница 182: ...Communication ABB Control AC 31 Page 7 11 1SBC 260400 R1001 b 06 99 ...
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Страница 190: ...AC 31 technical documentation ABB Control AC 31 Page 8 1 1SBC 260400 R1001 b 06 99 Chapter 8 Diagnosis ...
Страница 191: ...Diagnosis Page 8 2 ABB Control AC 31 1SBC 260400 R1001 b 06 99 Figure 8 1 Error detection LEDs ...
Страница 195: ...Diagnosis Page 8 6 ABB Control AC 31 1SBC 260400 R1001 b 06 99 Figure 8 2 AC31GRAF status window ...
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Страница 204: ...AC 31 technical documentation ABB Control AC 31 Annexes Page 1 1SBC 260400 R1001 b 06 99 Annexes ...
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Страница 218: ...AC 31 technical documentation ABB Control AC 31 Index Page 1 1SBC 260400 R1001 b 06 99 Index ...