Roland R1000 Series Manual page 85

B0060191 / Rev. 1.7
6.4.4 Service "Read parameters"
The master initiates the service "Read parameter" by selecting the service, and index bytes IN1
and IN2. The content of the application data bytes 0 to 3 is not relevant. 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 compulsory:
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 OUT3... OUT6. In addition
the R1000 mirrors the service "Read parameter" and the index adjustment in OUT1, OUT2. Only in
the last step sets the R1000 the handshake bit into output 0.0 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 IN1 and IN2. The
content of the application data bytes 0 to 3 are also stored. The checksum of byte 1 through 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 compulsory:
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 IN3...IN6 into its own parameter memory. Afterwards the R1000
mirrors the index adjustment in OUT1, OUT2 and the application data in OUT3...OUT6. Only in the
last step inserts the R1000 the handshake bit in output 0.0 and indicates thereby that the data has
been completely accepted. The same sequence applies here also, in order to avoid data faults.
The slave should ensure 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 Detector R1000-series I20
with integrated fieldbus interface
The application data bytes IN3 - IN6 of the service "Read
Note
parameter" are not relevant.
A collision bit is et if reading cannot be executed. Instead of
Note
application data the default number is transmitted, see "6.4.8 Reset
faulty access".
If writing cannot be executed, the collision bit is et. In place of the
Note
application data a fault number is transmitted, see section "6.4.8
Reset faulty access".
Manual
Communication with the PLC
85