Siemens SIMATIC ET 200M Operating Instructions Manual page 265

Response Time
The response time is the average time interval between an input modification and the
relevant output modification.
S7 diagnosis
You can use the user program to request S7 diagnosis for any module in the
SIMATIC S7 / M7 module range. The S7 diagnosis structure is the same for central and
distributed modules.
The diagnostic data of a module are located in the data records 0 and 1 in the module's
system data area. Data record 0 contains 4 bytes of diagnostic data that indicate the current
module state. Data record 1 also contains module-specific diagnostic data.
Data records 0 and 1 are part of the slave diagnosis.
Segment
The bus line between two terminating resistors forms a segment. A segment contains
between 0 and 32 → bus nodes. Segments can be linked via the RS 485 repeater.
Signal module
Signal modules (SM) are the interface between the process and the automation system.
Digital input and output modules (I/O module, digital) as well as analog input and output
modules (I/O module, analog) are available.
Slave
Before a slave can exchange data with a → master it must be prompted to do so by the
master.
By slaves we mean, for example, all DP slaves such as ET 200X, ET 200M, ET 200S, etc.
SNMP
SNMP (Simple Network Management Protocol) is the standardized protocol for diagnosing
and also configuring the Ethernet Network infrastructure.
In the office area and in automation technology, devices support a wide range of
manufacturers on the Ethernet SNMP.
SNMP-based applications can be operated parallel to applications with PROFINET on the
same network.
The scope of the supported functions varies depending on the device type. A switch, for
example, has more functions than a CP 1616.
STEP 7
Programming language used to create user programs for SIMATIC S7 control systems.
ET 200M
Operating Instructions, 12/2008, EWA-4NEB780600602-08
Glossary
263