INFICON PSG55x ATM to Medium Vacuum Gauge (Profibus) - Manual (Page 15)

tira56e1 (2010-02) PxG55x.cp
15
Index
16
0
Private
Public
Operations Public
Block_x
Parameter_2
Parameter_1
Parameter_0
Operation_1
Operation_2
Operation_n
Parameter_n
Attributes
Block_Type_Name
optional
optional
Slot x
Within the DataExchange mode the DP-master class 1 cyclically transmits and
requests data from all configured slaves in the network. This data transfer aims at
the fast propagation of measurement data and command data within the system.
The next two figures contain the input and output data of the Profibus device. The
data are divided between a parameter and a process data part.
The parameter data area contains a dedicated channel called parameter channel. It
allows the transmission of "single" cyclic requests by specifying an additional
protocol within the input and output data area. A concise description can be found
on page 16 "Parameter channel".
The process data contains the measurement and command data as described on
page 19 "Process data".
The Input Area (DxIn) as sent in the DataExchange telegram (transmitted by the
PxG55x) consists of the 8 byte parameter channel (if there is a parameter channel
in the telegram) and up to 8 byte of process data. The actual amount of process
data is determined by the board configuration of the basic device.
Octets
0…7
Octets
8…15
Parameter channel Process data
The Output Area (DxOut) as received in the DataExchange telegram (transmitted
by the master) contains the 8 byte parameter channel and 8 control bytes in the
process part of the telegram.
Octets
0…7
Octets
8…15
Parameter channel Process data
Assignment of the block
elements to the slot indices
4.2 Cyclic Data Telegrams
in Data Exchange Mode
Input data
Output data