Roland R1000 Series Manual page 51

B0063191 / 1.3
6.4.4 Service "Read parameters"
The master initiates the service "Read parameter" by selecting the service, and index bytes BIN1
and BIN2. The content of the application data bytes 0 to 3 is not relevant. The checksum of byte 1
to 6 is calculated and inserted into byte 7. To initiate the service the master changes the
handshake bit. In order to avoid data faults the following sequence is mandatory:
1. Service selection, program index, parameter index
2. Switch handshake
In addition consistent data transmission from master is necessary.
The R1000 checks the data with the checksum and makes the content of the respective
parameters available in the application data bytes of parameter channel BOUT3... BOUT6.
In addition the R1000 mirrors the service "Read parameter" and the index adjustment in BOUT1,
BOUT2. Only in the last step the R1000 sets the handshake bit intoBOUT0.0 and indicates thereby
that the data is valid. This sequence is observed by the R1000 in order to avoid data faults.
The slave should ensure a consistent data transmission.
6.4.5 Service "Write parameters"
Initiate the master with the setting of the service selection, the index bytes BIN1 and BIN2. The
content of the application data bytes 0 to 3 is also stored. The checksum of byte 1 to 6 is calculated
and inserted in byte 7. To initiate the service the master changes the handshake bit.
In order to avoid data faults the following sequence is mandatory:
1. Service selection, program index, parameter index, application data byte 0 to 3
2. Switch handshake
In addition consistent data communication from the master is necessary.
The R1000 checks the data with the checksum and transfers the content of the application data
bytes of the parameter channel BIN3...BIN6 into its own parameter memory. Afterwards the R1000
mirrors the index adjustment in BOUT1, BOUT2 and the application data in BOUT3...BOUT6. Only
in the last step inserts the R1000 the handshake bit in BOUT0.0 and indicates thereby that the data
has been completely accepted. The same sequence applies here also, in order to avoid data faults.
The slave ensures a consistent data transmission.
ROLAND ELECTRONIC GmbH · Otto-Maurer-Str. 17 · DE 75210 Keltern · Phone +49 (0)7236-9392-0 · Fax +49 (0)7236-9392-33
Double Sheet Control System R1000 series L20
with integrated fieldbus interface
Note
The application data bytes BIN3 - BIN6 of the service "Read
parameter" are not relevant.
Note
A collision bit is et if reading cannot be executed. Instead of
application data the default number is transmitted, see "6.4.8 Reset
faulty access".
Note
If writing cannot be executed, the collision bit is et. In place of the
application data a fault number is transmitted, see section "6.4.8
Reset faulty access".
Manual
Communication with the PLC
51