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MA 258
i
Leuze electronic
Bit 4: Next block ready to transmit: BLR
This bit is only relevant for reading slave data in Collective mode relevant, see chapter 11.1.1.
Bit 5: Data loss: DL
This bit is important for monitoring data transmission in Transparent and Collective mode.
Bit 6: Buffer overflow: BO
Input data
Description
Addr.
Data
type
Value range
Default
BLR
Next
bl
ock
r
eady to transmit
(new block ready)
The Block Ready toggle bit changes its state whenever the
fieldbus gateway has removed received data from the
receive buffer and registered it in the corresponding receive-
data bytes. This signals to the master that the quantity of data
indicated in the DLC bits to be present in the input data bytes
originated in the data buffer and is current.
0.4
Bit
0->1: Data
transmitted
1->0: Data
transmitted
0
Input data
Description
Addr.
Data
type
Value range
Default
DL
D
ata
l
oss
(Data transmission monitoring)
This bit is set until the device is reset (bit pattern see chapter
10.4 "RESET function / deleting memory") in case gateway
data was not able to be sent to the PLC and was lost. Fur-
thermore, this bit is set in case the configured 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
BO
Buffer overflow
(buffer overflow)
This flag bit is set to high ("1") when the buffer overflows.
The bit is automatically reset when the buffer again has
memory space available. While the BO bit is set, the RTS sig-
nal of the serial interface is deactivated.
The memory size of the gateway for the data of both the PLC
and the Leuze end device is 1 kByte.
0.6
Bit
0->1: Buffer
overflow
1->0:
Buffer o.k.
0
