Introduction
3.1 AS-Interface
Safety engineering with AS‑Interface in the SIMATIC ET 200SP, including typical circuit diagram
Function Manual, 08/2020, A5E44991382002A/RS-AB/002
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3.1.4 Number of nodes
An AS-i network contains a maximum of 62 slaves with unique AS-i addresses. The AS-i
master can manage 31 different addresses for the data exchange, whereby it can subdivide
and reference each address as an A address or B address.
Slaves with standard addressing can be set to an address in the range 1 ... 31.
Slaves with extended addressing have address numbers followed by A or B. They are set to an
address in the range 1A ... 31A or 1B ... 31B (often referred to as A/B slaves for short).
All slaves, whether with standard or extended addressing, are operated together on one AS-i
network. The AS-i master automatically manages the addresses.
Backup AS-i slaves always use standard addressing. Slaves with standard addressing or
extended addressing can be used for acknowledgment and other non-safety-related signals.
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