Section 1 Overview Fieldbus
M&I – AC 900F Controller 15
Fieldbus
PROFIBUS
®
PROFIBUS-DP is designed for rapid data exchange in the field area. Central control
units communicate with decentralized field devices like remote I/O, transmitters or
drives etc. using a fast serial connection. The data exchange with the distributed
modules is mainly performed on a cyclic basis. PROFIBUS-DP is optimized in
terms of high speed and simple device connection. This protocol variant is
specifically designed for the communication between programmable controllers and
a distributed I/O level. The AC 900F controller supports PROFIBUS Master
redundancy.
For additional information on PROFIBUS-DP and the PROFIBUS CI/CM modules,
please refer to Section 3, Modules as well as to the Engineering Manual,
Communication and Fieldbusses.
Modbus
Numerous automation systems support the Modbus protocol by default or as an
optional feature. This ensures easy communication with the AC 900F process
station via on-board SER interfaces using the RS232/RS485 standards
(MODBUS
®
) or TCP/IP (MODBUS TCP
®
). The Modbus protocol also ensures
process data exchange with other systems via the serial or the Ethernet interfaces of
the AC 900F.
This protocol allows data to be transmitted in either master or slave mode. For the
configuration with serial interface, a specific MODM_DEV interface object must be
assigned in the hardware structure. The interface-specific parameters are defined in
this block.
For the TCP configuration (Ethernet), a specific MTCP_DEV interface object must
be assigned in the hardware structure.
Please refer to the Engineering Manual, Communication and Fieldbusses and the
Engineering manual, System Configuration, Hardware Structure for more
detailed information.
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