Leuze electronic GmbH + Co. KG
MA 238
i
40
Bit 2 … 6: Address bits 0 .. 4: Address 0 .. 4
Bit 7: New Data: ND
10.3.3 Detailed description of the bits (output byte 1)
Bit 0: Read-Acknowledge: R-ACK
This bit is only relevant for writing slave data in blocks (Collective mode), see Chapter 11.1.2.
Bit 2: Send Data from Buffer: SFB
This bit is only relevant for writing slave data in blocks (Collective mode), see Chapter 11.1.2.
Bit 3: Copy to Transmit Buffer: CTB
This bit is only relevant for writing slave data in blocks (Collective mode), see Chapter 11.1.2.
Output data
Description
Addr.
Data
type
Value range
Default
Address 0..4
Address bits 0 .. 4
As with the broadcast command, individual devices in
the multiNet can also be addressed via the MA 3x. In this
case, the corresponding address of the device precedes
the data field telegram.
0.2
…
0.6
Bit
00000: Addr. 0
00001: Addr. 1
00010: Addr. 2
00011: Addr. 3
…
0
Output data
Description
Addr.
Data
type
Value range
Default
ND
New Data
This bit is needed if several identical pieces of data are
to be sent in sequence.
0.7
Bit
0->1; 1->0:
On each status change
for new data
0
Output data
Description
Addr.
Data
type
Value range
Default
R-ACK
Read-Acknowledge
(read confirmation)
Toggle bit: Indicates to the fieldbus gateway that the
"old" data has been processed and that new data can be
received. At the end of a read cycle, this bit must be tog
-
gled in order to be able to receive the next data set. This
toggle bit is switched by the master after valid received
data has been read out of the input bytes and the next
datablock can be requested. If the gateway detects a sig
-
nal change in the R-ACK bit, the next bytes are automat
-
ically written from the receive buffer to the input data
words and the BLR bit toggled. Further toggling erases
the memory (to 00h).
1.0
Bit
0->1 or
1->0: Successfully writ
-
ten & ready for the next
transmission
0
Output data
Description
Addr.
Data
type
Value range
Default
SFB
Send data from buffer
(send data from the gateway transmission buffer to the
RS 232)
Toggle bit: changing this bit causes all data which was
copied to the transmission buffer of the fieldbus gateway
via the CTB bit to be transmitted to the RS 232 interface
or the connected Leuze device.
1.2
Bit
0->1: Data to RS 232
1->0: Data to RS 232
0
Output data
Description
Addr.
Data
type
Value range
Default
CTB
Copy to Transmit Buffer
(data transferred to the transmission buffer)
Toggle bit: Changing this bit writes the data from the PLC
to the transmission buffer of the fieldbus gateway. This
is used, for example, for long command strings which
must be transmitted to the connected ident device.
The CTB toggle bit is switched whenever transmit data
is not to be sent directly via the serial interface, but
instead transferred to the transmission buffer.
1.3
Bit
0->1: Data in buffer
1->0: Data in buffer
0
