Lenze · Decentralised frequency inverter 8400 motec (AS-Interface option) · EDS84DMOTASI EN 5.0 - 02/2019 31
Data transfer
AS-i messages
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Structure of the master call
Structure in the standard addressing mode for up to 31 slaves:
Structure in the advanced addressing mode for up to 62 slaves:
Structure of the slave response
ST SB Address Information PB EB
1 bit 1 bit 5 bits 5 bits 1 bit 1 bit
ST SB Address Information PB EB
1 bit 1 bit 5 bits 1 bit Select
bit
3 bits 1 bit 1 bit
Bit field Description
ST The start bit marks the start of the master call.
•0: Valid start bit
•1: Not permitted
SB The control bit designates the call of data, parameters, addressing or commands.
• 0: Data/parameter/addressing call
•1: Command call
Address • 5 address bits contain the address of the slave to be called.
• Valid address range: 1 ... 31
Information Depending on the call type, the information bits contain the information that is transmitted
to the slave.
• 5 information bits in standard addressing mode
• 4 information bits in advanced addressing mode
Advanced addressing mode:
• For the advanced addressing mode (for up to 62 slaves), an additional select bit has been
defined.
• This has been defined in order that an A slave behaves the same as a standard slave. An
A slave can also be operated in networks where the master cannot distinguish between
A and B slaves. A/B slaves can be recognised by the hexadecimal ID code "0xA".
• Valid address range: 1A ... 31A, 1B ... 31B
PB Parity bit: The sum of all 1 bit states in the master call must be even.
EB The end bit marks the end of the master call.
•0: Not permitted
• 1: Valid end bit
ST Information PB EB
1 bit 4 bits 1 bit 1 bit
Bit field Description
ST The start bit marks the start of the slave response.
•0: Valid start bit
•1: Not permitted
Information The 4 information bits contain the information that is transmitted to the master.
PB Parity bit: The sum of all 1 bit states in the slave response must be even.
EB The end bit marks the end of the slave response.
•0: Not permitted
• 1: Valid end bit
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