OPTBK AS-interface board
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1
1.2.1
AS-interface technical data
The AS-interface is a simple master-to-slave structure. The master controls all time and network
traffic. The protocol is embedded in the hardware. There are no configuration files to maintain. All
nodes are “AB Slaves”. The slaves have a maximum of 4 discrete input bits and 4 discrete output
bits. The address range is 1A-31A and 1B-31B, with 0 being reserved for new incoming slaves. “0”
is the default address set by manufacturers when a slave leaves the factory.
The board can be configured with the bits as the following table:
Network type:
Master/Slave Communication System
AS-Interface profile S-7.A.7 (AS-i specifications 3.0)
IO code 7
ID code A
ID1 code 7
ID2 code 7
Topology:
Very flexible with Line, Bus, Star or Tree Topology
Installation:
Special (yellow) unshielded cable with 2 wires providing data and 30 V.
Alternatively data and power on separate cables 100 m length per
Segment, extendible up to 300 m with Repeaters
Max. current
consumption:
150 mA
Data Rate:
167 kBit/s
Max. Stations:
1 Master and up to 62 Slaves
Data:
each Slave: - 4 bit digital Input and 4 bit digital Output Data
Network Features:
Data values become refreshed at the slave in less than 21 ms; all 4
output bits operate simultaneously
User Organization:
AS-International
Table 1. AS-interface technical data
Parameter bits
P0
Communication monitoring (Watchdog)
P0 = 0 monitoring = off, the outputs maintain the status if communi-
cation fails (default setting)
P0 = 1 monitoring = on, i.e. if communication fails, the outputs are
deenergised
P1
Input filter
P1 = 0 input filter on, pulse suppression (default setting)
P1 = 1 input filter off
P2
Synchronous mode
P2 = 0 synchronous mode on (default setting)
P2 = 1 synchronous mode off
P3
Not used
Table 2. Description of parameter bit function.
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