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The SAMSON Type 3787 Foundation Fieldbus Positioner contains the following blocks:
One Resource Block.
One Standard Advanced Positioner Valve Transducer Block.
Two Function Blocks:
one Analog Output Function Block,
one PID Function Block.
Set point
SP
SP_HI_LIM
SP_LO_LI
MODE_BLK
READBACK
Characteristic
selection
Charact
Fail-safe action
ACT_FAIL_ACTION
FINAL POSITION VALUE
RATED_TRAVEL
Transducer Block
Fig. 12 ⋅ Block structure
Set point
SP
limits
ramps
Sp_RATE_DN
Sp_RATE_UP
XD, PV scaling
XD_SCALE, PV_SCALE
PV
Final Value
high
FINAL_VALUE_CUTOFF_HI
low
FINAL_VALUE_CUTOFF_LO
PD controller
PWM
SERVO_GAIN_1
SERVO_GAIN_2
PWM
SERVO_RATE
Filter
PV, XD
Output
scaling
options
XD_SCALE
IO_OPTS
PV_SCALE
Analog Output Block
> _
1
e
> _ 1
&
Pneumatik
Block
e
&
&
Parameter description
OUT
OUT
MODE_BLK
(manual)
1: active
0: inactive
Forced venting
> _
Fail-safe position
Hardware, firmware error
Supply air
p
p
To outside
EB 8383-1 EN
39
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