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The AC 900F controller truly extends the hardware portfolio of Freelance distributed control system. Apart from its highly sophisticated automation functions, the AC 900F modular controller offers expanded flexibility via a pluggable SD card, more Ethernet ports, redundancy options for high availability and powers for around 1,500 I/Os when using the Plus CPU (PM 904F) and Standard CPU (PM 902F) or up to 400 I/Os when using the Lite CPU (PM 901F).A key feature of the AC 900F is the support of SD cards. Especially the new optional display for AC 900F allows to load applications or firmware into the controller, without PC or FTP software.
The AC 900F consists of:• CPU module PM904F, PM 902F or PM 901F with- four Ethernet interfaces for PM904F, PM 902F or three Ethernet interfaces for PM 901F- one diagnostic interface- two serial interfaces- display unit (optional)• Up to ten S700 I/O modules directly attached on terminal units• A maximum of four fieldbus interface modules for PM 904F• A maximum of two fieldbus interface modules for PM 902F and PM 901F
The AC 900F controller can be arranged in a single or redundant manner. The controller supports remote I/Os, transmitters, actuators, drives and other devices, for example through PROFIBUS and other fieldbus protocols. Atpresent, the following field busses are available for the AC 900F controller:
• PROFIBUS DP V0/V1• Modbus RTU and Modbus TCP• Telecontrol and Telecontrol TCP• CAN Bus for connection of Freelance Rack I/O
Input/output modules are used as direct I/O and remote I/O in accordance with the type and quantity of process signals. The hardware configuration of AC 900F is based on a hardware function block concept similar tothe configuration like AC 700F and AC 800F.PM 902F/PM 901F can be equipped with a maximum of two PROFIBUS modules. PM 904F can be equipped with maximum of four PROFIBUS modules. The controllers are optionally redundant. Modular plug-in I/O modules are used in accordance with the type and quantity of process signals. With AC 900F controllers, fieldbus compliant components such as remote I/O, field devices, and network components can be used.