Roland R1000 Series Manual page 94

Communication with the PLC
6.4.5 Service "Write parameters"
Initiate the master with the setting of the service selection, the index bytes E1 and E2. 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 E3... E6 into its own parameter memory. Afterwards the R1000
mirrors the index adjustment in A1, A2 and the application data in A3..A6. Only in the last step
inserts the R1000 the handshake bit in A0.0 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.
6.4.6 Service "Empty service"
The master initiates the service "Empty service" with the setting of the service selection. The
content of the index bytes E1, E2 and the application data bytes 0 to 3 are not relevant. The
checksum of byte 1 through 6 is calculated and inserted in byte 7. To initiate the service the master
switches 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 mirrors the index adjustment in A1, A2 and the
application data in A3..A6. A possibly set collision bit is set back. Only in the last step inserts the
R1000 the handshake bit in A0.0 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.
6.4.7 Service "Reset parameter channel"
The service "Rest parameter channel" initiates the master by transferring a zero string. The service
was added for safety reasons during the start up of the system or in case a fault occurs in the bus.
The R1000 closes the parameters channel and mirrors "parameters channel closed" (38 00 00 00
00 00 00 00 Hex). The handshake bit remains set to 0. The collision bit is also set to 0.
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94
Double Sheet Detector R1000 series E20
with integrated fieldbus interface
Attention If writing cannot be executed, the collision bit is set. In place of the
application data a fault number is transmitted, see section "6.4.8
Reset faulty access".
Attention If the service "Empty service" cannot be executed, the collision bit is
set (remains set). In place of the application data a fault code is
transmitted, see section "6.4.8 Reset faulty access".
Attention If the fieldbus is off-line the service "Reset parameter channel" is
automatically executed.
Manual
B0046191 / Rev. 1.12