Siemens SIMATIC ET 200M Manual page 224

Process interrupt
A process interrupt is triggered by S7-300 modules with interrupt capability
because of a certain event in the process. The process interrupt is reported to
the central CPU. The assigned organization block is then processed in
accordance with the priority of this interrupt.
In SIMATIC S7/M7: As a result of the parameterization of an upper and lower
limit value, for example, an operating range is defined. If the process signal (e. g.
temperature) of an analog input module leaves this range, the module triggers a
process interrupt (assuming an interrupt is enabled). The CPU interrupts the
processing of the user program and lower priority class and processes the
process interrupt block (OB 40).
In SIMATIC PCS 7: If the IM 153-2 reports a process interrupt, there is at least
one data record containing messages concerning time-stamped signal changes
or special messages. The DP master CPU can read and evaluate the data
record(s).
In SIMATIC S5: The process interrupt appears in the station diagnosis. Using
cyclical querying of the diagnostic bits in the station diagnosis, you can recognize
process interrupts such as an upper limit violation.
PROFIBUS
PROcess FIeld BUS which is defined in the PROFIBUS
IEC 61784-1:2002 Ed1 CP 3/1 standard. It defines the functional, electrical and
mechanical properties of a bit-serial field bus system.
PROFIBUS is a bus system that networks PROFIBUS-compatible programmable
logic controllers and field devices at the cell and field level. PROFIBUS is
available with the protocols DP (the German abbreviation for distributed I/O),
FMS (= field bus message specification) or TF (= technology functions).
PROFIBUS address
Each bus node must receive a PROFIBUS address to uniquely identify it on the
PROFIBUS-DP bus system.
The PC/programming device or the hand-held ET 200 have the PROFIBUS
address "0".
DP master and DP slaves have a PROFIBUS address from 1 to 125.
Distributed I/O Device ET 200M
EWA-4NEB780600602-06
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Glossary
Glossary-7