Leuze electronic GmbH + Co. KG
MA 238
i
7
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.
• ESI file (EtherCAT Slave Information):
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 com
-
pletely 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 different depending
on the device. These commands are not interpreted by the MA 238
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 regis
-
tered data is sent by the PLC to the MA 238
i
.