General information
Leuze electronic
MA 258
i
7
TNT
35/7-2
4
V
1.4
Definition of terms
For better understanding of the explanations provided in this document, a definition of terms
follows below:
•
Bit designation:
The 1st bit or byte begins with count number "0" and means bit/byte 2
0
.
•
Data length:
Size of a valid, continuous data packet in bytes.
•
EDS file (electronic data sheet):
Description of the device for the control.
•
Consistent:
Data which belongs together with regard to content and which must not be separated
is referred to as consistent data. When identifying objects, it must be ensured that
the data is transmitted completely and in the correct order, otherwise the result is
falsified.
•
Leuze device (DEV):
Leuze devices, e.g., bar code readers, RFID readers, VisionReader…
•
Online command:
These commands refer to the respective, connected ident device and may be differ-
ent depending on the device. These commands are not interpreted by the MA 258
i
,
but are instead transmitted transparently (see description of Ident device).
•
CR:
Cross reference.
•
Perspective of I/O data in the description:
Output data is data which is sent by the control to the MA. Input data is data which
is sent by the MA to the control.
•
Toggle bits:
Status toggle bit
Each change of state indicates that an action was performed, e.g., bit ND (new data):
each change of state indicates that new received data was transmitted to the PLC.
Control toggle bit
An action is performed on each change of state, e.g., bit SDO: on each change of
state, the registered data is sent by the PLC to the MA 258
i
.
