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AS-i/INTERBUS Gateway
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7 AS-i/INTERBUS Gateway
The primary task of the AS-i/INTERBUS gateway is to transfer bits from INTER-
BUS to the AS-i slaves (actuators) and to transfer bits from the AS-i to INTERBUS.
On the one hand, the AS-i/INTERBUS gateway is controlled by the INTERBUS
master, i. e. it is an INTERBUS slave. On the other hand, it is the AS-i master, i. e.
it monitors the AS-i network connected to it and controls all processes on it.
The processes on the two sides run independently of one another:
• The information from the process data channel on INTERBUS is temporarily
stored in the AS-i/INTERBUS gateway until it can be transferred to the appro-
priate AS-i slave;
• The most recent available information from all the AS-i slaves is forwarded in an
INTERBUS cycle via the process data channel to the INTERBUS master.
The maximum delay between INTERBUS master and AS-i slave is determined by
the cycle time for the AS-i and the cycle time of INTERBUS.
7.1 Information Exchange over INTERBUS
The AS-i/INTERBUS gateway uses according to the configuration 16-bit words on
INTERBUS:
• One word is used for the PCP (Peripherals Communication Protocol) through
which the AS-i/INTERBUS gateway is programmed and queried; the PCP word
does not appear in the process image of the PLC. The INTERBUS master au-
tomatically masks out this word.
• One word is used as the control word. The INTERBUS master can use this to
interrupt data transmission in the AS-i network.