Glossary
Glossary-9
Distributed I/O Device ET 200M
EWA-4NEB780600602-06
Response monitoring
This is a slave parameter. If a DP slave is not addressed within the response
monitoring time, then it goes into the safe status, i. e. the DP slave sets its
outputs to ”0”.
Response time
The response time is the average time between changing an input and the
consequent changing of an output.
S7 diagnostics
An S7 diagnosis can be requested for all the modules in the SIMATIC S7/M7
range of modules in the user program. The structure of the S7 diagnostic data is
the same for both central and distributed modules.
The diagnostic data of a module is in data records 0 and 1 of the system data
area of the module. Data record 0 contains 4 bytes of diagnostic data describing
the current state of a module. The data record 1 also contains module-specific
diagnostic data.
Data records 0 and 1 are included in the slave diagnosis.
Segment
The bus line between two terminating resistors forms a segment. A segment
contains 0 to 32
³
bus nodes. Segments can be interconnected by means of
RS 485 repeaters.
Signal module
Signal modules (SMs) represent the interface between the process and the
programmable controller. Input and output modules can be digital (input/output
module, digital) or analog (input/output module, analog).
Slave
A slave can only exchange data with a
³
master when requested by it to do so.
By slaves we mean, for example, all DP slaves, such as ET 200B, ET 200C,
ET 200M etc.
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