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MA 20
8
i
Le
u
ze electronic
10.2.2
Detailed description of the bits (input byte 0)
Bit 2: Service mode active: SMA
Bit 5: Data loss: DL
This bit is important for monitoring data transmission in Transparent and Collective mode.
Bit 7: New data: ND
This bit is only relevant in Transparent mode.
10.2.3
Detailed description of the bits (input byte 1)
Bit 0 … 7: Data length code: DLC0 … DLC7
Input data
Description
Addr.
Data
type
Value range
Default
SMA
S
ervice
m
ode
a
ctive (SMA)
The SMA bit is set if the service switch is set to "MA" or
"DEV", i.e. if the device is in either fieldbus gateway or Leuze
device service mode. This is also indicated by a flashing PWR
LED on the front side of the device. Upon changing to the
normal operating mode "RUN", the bit is reset.
0.2
Bit
0: Device in
operating mode
1: Device in service
mode
0h
Input data
Description
Addr.
Data
type
Value range
Default
DL
D
ata
l
oss
(Data transmission monitoring)
This bit is set if gateway data could not be sent to the PLC
and were lost. Furthermore, this bit is set in case the config-
ured data frame, e.g. 8 bit, should be smaller than the data
to be transmitted to the PLC, e.g. bar code with 20 digits. In
this case, the first 8 digits are transmitted to the PLC, the rest
are truncated and are lost. In this process, the Data loss bit
is also set.
0.6
Bit
0->1:
Data loss
0
Input data
Description
Addr.
Data
type
Value range
Default
ND
N
ew
d
ata
(new data)
This bit is toggled on each data set that is sent from the gate-
way to the PLC. This can be used to differentiate between
multiple, identical data sets that are sent to the PLC.
0.7
Bit
0->1; 1->0:
On each status
change for new data
0
Input data
Description
Addr.
Data
type
Value range
Default
DLC0 … DLC7
D
ata
l
ength
c
ode
(number of user data in bytes)
Stored in these bits is the number of user data bytes trans-
mitted to the PLC which follow.
1.0 …
1.7
Bit
1
h
(00001
b
) …
FF
h
(00255
b
)
0h (00000b)
