Bürkert 8643, Operating Instructions Manual, Page: 29 / 36

8643 - 29
english
7.2.2 Description of some block parameters
of the function block (DO)
Parameter Description
READBACK_D This parameter reports the position of the
valve and the sensors.
7 6 5 4 3 2 1 0 Bit
0 0 not initialized
0 1
closed
1 0 open
1 1 moving
state
sensor 1
short-circuit
sensor 1
open circuit
sensor 1
state
sensor 2
short-circuit
sensor 2
open circuit
sensor 2
Legend: 1 = active, 2 = inactive
A sensor failure changes the status to
"BAD"/Sensor-failure.
SP_D Setpoint value
Bit 0 in the value specifies the valve posi-
tion.
(The status must be „GOOD“ (0x80
hex))
RCAS_IN_D Setpoint in the state RCAS (Remote Cas-
cade).
Bit 0 in the value specifies the valve posi-
tion.
CHANNEL Indicates the transducer block.
Channels 1-4 are for the DO_valve_TB (1
output, 2 inputs) and the channels 5-8 are
for the DO_TB (1 output).
If the channel 100 is entered, the inputs i.
e. outputs will not be occupied.