Siemens SIMATIC ET 200M Operating Instructions Manual page 262

Glossary
Parameter assignment master
Each DP slave has a parameter assignment master. During startup the parameter
assignment master provides the DP slave with the parameterization data. It has read-write
access to the DP slave and can change a DP slave's configuration.
PLC
→ Programmable logic controller
Prioritized startup
Prioritized startup denotes PROFINET functionality for accelerating the startup of IO devices
for RT and IRT communication within a PROFINET IO system.
The function reduces the time that the correspondingly configured IO devices require to
recover the cyclic exchange of user data in the following situations:
● after power has returned
● after station recovery
● after activation of IO devices
Product version
Any product with an order number has a product version. Reasons for revising the product
version include upward-compatible function enhancements, production-related changes
(new parts and components) and fault corrections.
PROFIBUS
Process Field BUS: a process and field bus protocol defined in the PROFIBUS standard
IEC 61784 1:2002 Ed1 CP 3/1. This standard specifies the operational, electrical and
mechanical properties of a bit-serial field bus system.
PROFIBUS is a bus system that connects PROFIBUS compatible automation systems and
field devices on a cell and field level. PROFIBUS is available with the following protocols: DP
(= Dezentrale Peripherie, distributed IO devices), FMS (= fieldbus message specification) or
TF (= technological functions).
PROFIBUS address
Each bus node must receive a PROFIBUS address to identify it uniquely on the PROFIBUS
DP.
PC / PD or the ET 200 Handheld have the PROFIBUS address "0".
DP masters and DP slaves use a PROFIBUS address in the range between 1 and 125.
PROFIBUS DP
PROFIBUS bus system with DP protocol. DP is the abbreviation of the German term
'dezentrale Peripherie' (distributed I/O). The ET 200 distributed I/O system is based on
standard IEC 61784-1:2002 Ed1 CP 3/1.
260
Operating Instructions, 12/2008, EWA-4NEB780600602-08
ET 200M