Bronkhorst®
Instruction Manual EL-PRESS™
9.17.101I
26
DeviceNet™
On DeviceNet™ instruments, the MSD switch provides a smaller range (0-6) and a 'P' option. With this option, the node
address is set according to the digital parameters (instead of by setting both switches to 0).
DeviceNet™ instruments have a third switch, for setting the baud rate:
Data rate
Baud rate
1
125000 (default)
2
250000
5
500000
P
Programmable
With the 'P' option, the baud rate is set by the according digital parameter
EtherCAT®
Bronkhorst® instruments with an EtherCAT® interface have 3 rotary switches, with which the EtherCAT® Second Address can
be set in the range of 0 – 4095 (0xFFF). This value is copied to the Configured Station Alias register (address 0x0012:0x0013)
at instrument start-up.
3.6
Communication
The following table lists the supported communication modes of the EL-PRESS™:
Connection
Type
Communication standard
Fieldbus/protocol
9-pin D-sub
Analog
0…5Vdc
0…10Vdc
0…20mA
4…20mA
n/a
Digital
RS232
RS485
FLOW-BUS
Modbus
Fieldbus specific
Digital
RS485
FLOW-BUS
Modbus
PROFIBUS DP
DeviceNet™
Ethernet
PROFINET
EtherCAT®
The communication standards (analog and digital) and fieldbus interface (if applicable) are specified at ordering time, i.e.:
·
In analog mode, the instrument is set to the specified voltage/current range
·
The dedicated fieldbus connection only provides the specified fieldbus interface
Using analog and digital interfaces simultaneously
The instrument can be monitored and operated via the analog and a digital interface simultaneously, but it only accepts a
setpoint from one of both (this is called the control mode; see
for more information). In analog mode,
the analog input and output signals are translated to the digital setpoint and measure parameter respectively. The default
control mode (analog or digital) is determined at ordering time.
3.6.1
Analog operation
With analog operation, the following signals are available:
·
output signal: measured value
·
input signal: setpoint (controller only)
·
valve voltage (controller only)
Setpoints below 2% of the full scale will be interpreted as 0%.
The analog interface type that is installed on the 9-pin D-sub connector can be found in the
of the instrument.
