Appendix 173/176
3 842 530 344/2014-05, MIT: ID 40,
Bosch Rexroth AG
16.2 Abbreviations and terms
Technical term
Description
Sign-off
Terminates MDT communication either with the commands DIS-
CONNECT/RECONNECT or the appropriate auto mode.
Actual link state
Shows the current link state between SLK and MDT.
Commanded
link state
Command to the SLK to change the system link state, e.g., from
the
CONNECTED
state phase to close the MDT.
Auto mode
Automatically terminates the data transmission phase with >auto
reconnect or >auto disconnect.
Auto disconnect
Automatically terminates the data transmission phase and turns
off the >HF field.
Auto reconnect
Automatically terminates the data transmission phase, but the HF
field remains on.
Buffered prefetch
Data is read and stored in internal buffers.
Byte array
Data array with a width of 8 bits and variable size.
CAN
Abbreviation for the CANopen fieldbus system that offers stan-
dardized payload transmission services.
COB ID
Communication Object Identifier. Unique ID of a data telegram in
CANopen.
CONNECTED
state
Direct MDT access via the fieldbus. The
CONNECTED
state has to
be terminated by a bus command.
Data block
A data block consists of the SLK address and a byte count. The
SLK address is the start address, and the byte count determines
the area length from the start address. It is written as address/
byte count.
Unbuffered prefetch
Data is read and transmitted without buffers via >event-oriented
data exchange.
Event-oriented
data exchange
Cyclical data transmission from the SLK to the PLC.
Emergency shell
Active shell after fatal system error.
Fieldbus master
User on a bus system with command authority over subordinate
users (>slaves).
Fieldbus slave
User on a bus system without command authority.
Formatting value
Entered in the MDT memory during MDT formatting.
HF field
Electromagnetic high frequency field. Allows communication be-
tween MDT and SLK without contact.
High byte
High byte of a 16-bit value.
IBS
Abbreviation for the Interbus open fieldbus system according to
standard EN 50254.
ID 40/SLK-CAN
Product designation for the SLK of the ID 40 system for connect-
ing to CANopen.
ID 40/SLK-IBS
Product designation for the SLK of the ID 40 system for connect-
ing to Interbus.
ID 40/SLK-PDP
Product designation for the SLK of the ID 40 system for connect-
ing to Profibus.
ID 80/E
Product designation for the forerunner system of the ID 40. The
MDTs in both identification systems are compatible.
Node number
The SLK can be reached in the fieldbus system under this number.
The node number is configured via the serial interface. The IBS
does not require node numbers.
Do not confuse with the SLK address!
Command-oriented
data exchange
Data transmission option independent of the cyclical functioning
of fieldbus systems.
Console
Shell
Low byte
Low byte of a 16-bit value.
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