Manual
Double Sheet Control System R1000 series L20
with integrated fieldbus interface
Communication with the PLC
B0063191 / 1.3
48
ROLAND ELECTRONIC GmbH · Otto-Maurer-Str. 17 · DE 75210 Keltern · Phone +49 (0)7236-9392-0 · Fax +49 (0)7236-9392-33
6.4
Parameter channel
The parameter channel is designed to exchange systems and parameter data of the R1000 with
the master. Primary purpose is the central data backup on the master. In addition, certain
measurement and operating parameters can be extracted from the R1000 and analyzed by the
master.
Note
When re-transmitting the system and program parameters, the system
parameters must be re-transmitted first!
Note
The configuration of the data format has to be compatible with the PLC for
consistent data transmission!
The data transmission via the parameter channel must be initiated with the service “Open
parameter channel“. The end of data transmission mission via the parameter channel must be
completed with the service “Close parameter channel“.
If the parameter channel is open then it is not possible to issue control commands via the process
channel or via inputs on the keyboard.
6.4.1 Structure of the parameter channel
Inputs (PLC
L20)
Ausgänge (L20
PLC)
Byte
Meaning
Byte
Meaning
Parameter c
hannel
BIN0 Management
BOUT0
Management
BIN1
Program index
BOUT1 Program index
BIN2
Parameter index
BOUT2 Parameter index
BIN3
Application data byte 0
BOUT3 Application data byte 0
BIN4
Application data byte 1
BOUT4 Application data byte 1
BIN5
Application data byte 2
BOUT5 Application data byte 2
BIN6
Application data byte 3
BOUT6 Application data byte 3
BIN7 Checksum
BOUT7
Checksum
Data access control (management)
The management byte (BIN0) is used by the master to select the service (for example writing or
reading) and to confirm the access. The R1000 confirms via the management byte (BOUT0) the
execution of the command. The execution may need up to 100 ms. If an access is not allowed and
therefore, the service cannot be executed, then the R1000 declares this action as a collision.
Services have to be executed only by the master. The R1000 cannot initiate a data transmission as
slave.
Program index
Program index enables the access to one of the 255 programs. The access to the systems
parameters is made via the program index 255.
Parameter index
The parameter index enables the access to the parameters of each program.
Application data bytes
The application data bytes 0 to 3 contain the data which must be transmitted.
Checksum
The checksum is formed of the bytes 1 – 6. The bytes BIN1 to BIN6 respectively BOUT1 to BOUT6
are summed.
The least significant is the respective checksum.
