Siemens SIMATIC ET 200AL - Page 1215

Glossary
PROFINET with STEP 7 V15
268 Function Manual, 12/2017, A5E03444486-AH
Slave
A slave can only exchange data after being requested to do so by the master.
→ See also DP slave
SNMP
The network management protocol SNMP (
S
imple
N
etwork
M
anagement
P
rotocol) uses the
wireless UDP transport protocol. It consists of two network components, similar to the
client/server model. The SNMP manager monitors the network nodes and the SNMP agents
collect the various network-specific information in the individual network nodes and stores it
in a structured form in the MIB (
M
anagement
I
nformation
B
ase). This information allows a
network management system to run detailed network diagnostics.
STEP 7
STEP 7 is an engineering system and contains programming software for the creation of
user programs for SIMATIC S7 controllers.
Subnet
All the devices interconnected by switches are nodes of the same network or subnet. All the
devices in a subnet can communicate directly with each other.
All devices in the same subnet have the same subnet mask.
A subnet is physically restricted by a router.
Subnet mask
The bits set in the subnet mask decide the part of the IP address that contains the address
of the network.
In general, the following applies:
● The network address is obtained from the AND operation of the IP address and subnet
mask.
● The device address is obtained from the AND NOT operation of the IP address and
subnet mask.
Switch
Network components used to connect several terminal devices or network segments in a
local network (LAN).