II - DCE FEL ČVUT v Praze

Glossary
DP slave
DP standard
E
Error handling via
OB
Error indication
ET 200
F
Field
Field device
Glossary-4
A slave which is operated on the PROFIBUS with the PROFIBUS-DP
protocol and which complies with EN 50170, Volume 2, PROFIBUS, is
referred to as a DP slave.
The bus protocol of the ET 200 distributed I/O system; it complies with
EN 50170, Volume 2, PROFIBUS.
When the operating system detects an error (for example, STEP 7 access
error), it calls the specific organization block (error OB) for this error,
where the further response of the CPU can be specified.
One of the possible responses of the operating system to a delay error. The
other possible responses are: error response in the user program, STOP
status of the IM 153.
The ET 200 distributed I/O system with the PROFIBUS-DP protocol is a bus
designed for connecting distributed I/O units to a CPU or a suitable DP
master. ET 200 is distinguished by its fast response times, since only small
volumes of data (bytes) are transferred.
ET 200 is based on EN 50170, Volume 2, PROFIBUS.
ET 200 operates according to the master-slave principle. The DP master may
be an IM 308-C master interface, for example, or a CPU 315-2 DP.
The DP slaves may be distributed I/O units (ET 200B, ET 200C, ET 200M,
ET 200U) or DP slaves from Siemens or other vendors.
Either, an area of a plant outside the control room where measured values can
be acquired through communication or manipulated values can be sent to
actuators.
Or part of a message, for example an address field or command field, which
has been allocated a particular function. The size or other rules for the
interpretation of each field are part of the protocol specification.
A transducer which is located in the field and exchanges data with the
CPU via communication.
I/O Modules with Intrinsically-Safe Signals
C79000-G7076-C152-04