Siemens SIMATIC IM 151/CPU - PROFIBUS

Glossary
Glossary-9
ET 200S Interface Module IM 151/CPU
A5E00058783-01
PROFIBUS
Process Field Bus is a German process and field bus standard, defined in the
IEC 61158/EN 50170, Volume 2, PROFIBUS standard. It defines the functional,
electrical and mechanical features of a bit-serial field bus system.
PROFIBUS is available with the protocols DP (the German abbreviation for
distributed I/O), FMS (= field bus message specification), PA (= process
automation) or TF (= technology (process-related) functions).
PROFIBUS Address
Each bus node must receive a PROFIBUS address to identify it uniquely on the
PROFIBUS bus system.
The PC/programming device has the PROFIBUS address ”0”.
The PROFIBUS addresses 1 to 125 are permissible for the ET 200S distributed
I/O system.
Programmable Controller
Programmable controllers (PLCs) are electronic controllers whose function is
saved as a program in the control unit. The configuration and wiring of the unit
are therefore independent of the function of the control system. The
programmable logic controller has the structure of a computer; it consists of the
 CPU (central processing unit) with memory, input and output modules and an
internal bus system. The I/Os and the programming language are designed for
the purpose of control engineering.
Programming Device
Programming devices are essentially personal computers which are compact,
portable and suitable for industrial applications. They are equipped with special
hardware and software for SIMATIC programmable controllers.
Process Interrupt
A process interrupt is triggered by interrupt-triggering modules on the occurrence
of a specific event in the process. The process interrupt is reported to the CPU.
The assigned  organization block is then processed in accordance with the
priority of this interrupt.
Publisher
A sender in direct data communication See Direct Communication