Table 27: Process Data Of The Slot In "Ad-Hoc Communication" Mode - Basic Structure; Table 28: Process Data Of The Slots In "Ad-Hoc Communication" Mode - Control Byte C; Table 29: Process Data Of The Slots In "Ad-Hoc Communication" Mode - Status Byte S - WAGO I/O-SYSTEM 750 Manual

WAGO-I/O-SYSTEM 750
®
750-644 Bluetooth RF-Transceiver
least 2 bytes. The maximum value for the cut-off of a segment of an ad-hoc slot is
16 bytes.
Table 27: Process data of the slot in "Ad-hoc Communication" mode – basic structure
Byte
0
1 ... n
n: (size of the slot) - 1
Data is transmitted as needed to the respective remote Bluetooth
exclusively. If new data to send is provided by the PLC to the 750-644 I/O
module in the respective segment of the PIO, the 750-644 I/O module
acknowledges receipt and saves the data in the transmit buffer. If there is data in
the transmit buffer, the 750-644 I/O module attempts to transmit the data to the
other side until the transmit buffer is empty again. If the other side is not
accepting data, the transmit buffer fills up. If the transmit buffer is full, the
750-644 I/O module no longer accepts any data from the segment in the PII.
If the 750-644 I/O module receives data from the other side, the 750-644 I/O
module saves the data in an input buffer. If there is data in the input buffer, the
750-644 I/O module makes data in the segment of the PII available.
Data exchange between a PLC application and the 750-644 I/O module is
controlled by the control/status byte (C/S byte) of the respective slot.
The structure of the control byte and status byte is shown in the two tables below:
Table 28: Process data of the slots in "Ad-hoc Communication" mode – control byte C
Bit 7
TR
RA
CR
LEN
Table 29: Process data of the slots in "Ad-hoc Communication" mode – status byte S
Bit 7
TA
RR
CS
BF
LEN
Manual
Version 2.0.0, valid from FW/HW Version 03/03
Control byte C
Bit 6 Bit 5
LEN
TRANSMIT_REQUEST
If the value changes: Indication that the PIO contains new data for the respective device.
RECEIVE_ACKNOWLEDGE
If consistent with bit RR of the status byte: Confirmation that new data of the PII has been
processed.
CONNECT_REQUEST
If the value changes: Indication that a radio link to the device corresponding to this slot should be
established or disabled.
LENGTH
Indicates how many of data bytes D0 ... Dn of the PIO contain new data.
Bit 6 Bit 5
LEN
TRANSMIT_ACKNOWLEDGE
If consistent with bit TR of the control byte: Confirmation that new data of the PIO has been
processed.
RECEIVE_REQUEST
If the value changes: Indication that the PII contains new data for the respective device.
CONNECTION_STATUS
0: No connection
1: Connection available
BUFFER_FULL
0: Input buffer not full
1: Input buffer full
LENGTH
Indicates how many of data bytes D0 ... Dn of the PII contain new data.
Description
Control/status byte of the slot
Data byte D0 ... Dn
Bit 4 Bit 3
0
Status byte S
Bit 4 Bit 3
BF
Process Image
®
SPP device
Bit 2 Bit 1
CR RA
Bit 2 Bit 1
CS RR
51
Bit 0
TR
Bit 0
TA