Siemens CMAS-I Master ST

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.

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.