Roland R1000 Series Manual page 84

Communication with the PLC
6.4.2 Service "Open parameter channel"
The service open parameter channel is initiated by the master with the selection of the service. The
content of the indexbytes I1, I2 and the application data bytes 0 through 3 are not relevant. The
checksum of bytes 1 through 6 is calculated and inserted in byte 7. To initiate the service the
master changes the handshake bit.
To avoid data fault 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 mirrors the application data, the service
selection and the index selection into OUT1, OUT2.The R1000 sets the handshake bit in output 0.0
only in the last step and signals 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.
6.4.3 Service "Close parameter channel"
The service "Close parameter channel" is initiated by the master by selecting the service. The
content of the index bytes I1, I2 and the application data bytes 0 through 3 is not relevant. The
checksum of bytes 1 through 6 is calculated and inserted in byte 7. To initiate the service the
master changes the handshake bit.
To avoid data fault 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 mirrors the application data bytes, the service
selection and the index selection in OUT1, OUT2. The R1000 sets the handshake bit in output 0.0
only in the last step and signals 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.
ROLAND ELECTRONIC GmbH · Otto-Maurer-Str. 17 · DE 75210 Keltern · Phone +49 (0)7236-9392-0 · Fax +49 (0)7236-9392-33
84
Double Sheet Detector R1000-series I20
with integrated fieldbus interface
For the service "Open parameter channel" the index bytes IN1, IN2 and
Note
the application data bytes IN3... IN6 are not relevant.
If reading cannot be executed the collision bit is et. The fault number is
Note
transmitted instead of application data, see section "6.4.8 Reset faulty
access". The collision bit can be deleted with one of the following services:
Close parameter channel, Empty service or Reset parameter channel.
For the service "Open parameter channel" the index bytes IN1, IN2
Note
and the application data bytes IN3... IN6 are irrelevant.
If the checksum is correct then the closing of the parameter
Note
channel is always executed. A set collision bit is thereby deleted.
Manual
B0060191 / Rev. 1.7