The CM AS-i Master ST communication module is designed for use in the SIMATIC ET 200SP distributed I/O system and has the following features:

• As many as 62 AS-Interface slaves can be connected
• Supports all AS‑Interface master functions according to the AS‑Interface Specification V3.0
• User-friendly configuration with graphic display of the AS-i line in TIA Portal V12 and higher, or via GSD in other systems
• Supply via AS-Interface cable
• Suitable for AS‑i Power24V and for AS-Interface with 30 V voltage
• Integrated ground-fault monitoring for the AS-Interface cable
• Through connection to AS‑Interface, the number of digital inputs and outputs available for the control system is greatly increased (max. 496 DI/496 DQ on the AS‑Interface per CM AS‑i Master ST)
• Integrated analog value processing

ET 200SP Distributed I/O System

SIMATIC ET 200SP is a scalable and highly flexible distributed I/O system for connecting the process signals to a central control system via PROFIBUS or PROFINET.

Up to eight CM AS‑i Master STs can be plugged into a SIMATIC ET 200SP with the IM 155-6 PN standard interface module.

For more information, see "SIMATIC ET 200SP Distributed I/O system" System Manual, https://support.industry.siemens.com/cs/ww/en/view/58649293.

Design

The CM AS‑i Master ST module has an ET 200SP module enclosure with a width of 20 mm. A C0 type BaseUnit (BU) is required for use in the ET 200SP.

The communication module has LED indicators for diagnostics, operation, AS-i voltage and AS-i slave status and offers informative front-side module inscription for:

• Plain-text marking of the module type and function class
• 2D matrix code (Article No. and serial number)
• Connection diagram
• Color coding of the CM module type: light gray
• Hardware and firmware version
• Complete Article No.

Function

The CM AS‑i Master ST supports all specified functions of the AS‑Interface Specification V3.0.

The input/output values of the digital AS‑i slaves can be activated via the cyclic process image. The values of the analog AS‑i slaves can be attained via the cyclic process image (firmware V1.1 or higher) or via data record transfer.

If required, master calls can be performed with the command interface, e.g. read/write parameters, read/write configuration.

Changeover of the operating mode, automatic application of the slave configuration and the re-addressing of a connected AS‑i slave can be implemented via the control panel of the CM AS‑i Master ST in STEP 7.

Expansions from firmware version V1.1

In order to implement modular machine concepts, the AS‑i slaves can be activated or deactivated via the PLC program (option handling). The configuration of AS‑i slaves can be modified while being executed, thus enabling variable machine setups and tool changing with integrated input/output modules during ongoing operation. Without deactivating the controller, AS‑i input/output modules can be added in the system.

An existing AS‑i installation can be read into the STEP 7 hardware configuration and then adapted and documented in the project. Analog values are transmitted via the cyclic process image, the length of which is adjustable and extendable up to 288 bytes (depending on the interface module (IM) used).

Diagnostic information is accessed via automatic alarm indications, via the process image or data record reading in the user program or in the STEP 7 engineering system in a graphical overview matrix. The AS‑i network's transmission quality can also be read out. To avoid configuration errors, duplicate addresses in the AS‑i network can be detected.

The new functions are available with TIA Portal STEP 7 V13 SP1 or with STEP 7 V5.5 with HSP 2092 V3.0¹⁾. Configuration is possible with SIMATIC CPUs S7‑300 up to S7‑1500 and with a SINUMERIK 840D sl or other controller.

In the network view, the AS‑i slaves' online diagnostics status can be displayed directly on the slaves (for S7‑1500 CPUs with firmware version V2.0 or higher, with TIA Portal STEP 7 V14 or higher).

Notes on safety

In order to protect plants, systems, machines and networks against cyber threats, it is necessary to implement – and continuously maintain – a holistic, state-of-the-art industrial security concept. Siemens products and solutions only represent one component of such a concept.

For more information on the topic of Industrial Security, see http://www.siemens.com/industrialsecurity.

¹⁾HSP 2092, see https://support.industry.siemens.com/cs/ww/en/view/23183356.

Configuration

The following software is required for configuration of the CM AS‑i Master ST module:

• STEP 7 (classic) V5.5 SP3 HF4 or higher with HSP 2092 or HSP 2092 V3.0 (for firmware V1.1) or
• STEP 7 (TIA Portal) V12 or higher or V13 SP1 or higher (for firmware V1.1) or
• the GSD file of the ET 200SP with STEP 7 or another engineering tool

STEP 7 enables user-friendly configuration and diagnostics of the AS-i master and any connected slaves.

Alternatively, you can also apply the AS-Interface ACTUAL configuration as the DESIRED configuration at the "touch of a button" via the control panel integrated in the TIA Portal or an optional expansion button. Configuration with the GSD file is possible only with the button.

The CM AS-i Master ST module occupies up to 288 input bytes and up to 288 output bytes in the I/O data of the ET 200SP station. The I/O assignment depends on the configuration in STEP 7.

Together with an ET 200SP CPU 1510SP/1512SP (firmware V1.8 or higher) or 1515SP PC, preprocessing of safe AS‑i signals directly in the ET 200SP station and setting up of an independent AS‑i station without a higher-level CPU are possible (TIA Portal V13 SP1 Update 4 and higher).

Configuration of an AS-Interface network with CM AS‑i Master ST via TIA Portal