Flowserve MX FOUNDATION Fieldbus Field Unit - Manual (Page 32)

MX/QX FOUNdaTION Fieldbus Field Unit FCd LMENIM2330-01 – 08/11
32
Chan. No.4 — DI_ACTUATOR_FAULTS_1_CHAN — Mechanical and electrical faults 1
Chan. No.5 — DI_ACTUATOR_FAULTS_2_CHAN — Mechanical and electrical faults 2
Chan. No.6 — DI_ACTUATOR_ALARMS_CHAN — Emergency shutdown and inhibits
Chan. No.7 — DI_DISC_USER_INPUT_CHAN — Discrete input from user
Chan. No.8 — DI_READ_DISC_OUTPUT_CHAN — Read discrete output
Figure 3.4 – Discrete Input Function Block
Normally the block is used in Automatic Mode so that the Process Variable is copied to the Output.
If necessary, the operator can change the mode to Manual, which disconnects the field signal and
substitutes a manually entered value for the Output.
Inputs
The discrete input comes from a transducer, as selected by the CHANNEL.
Outputs
OUT_D is the block discrete output.
The FIELD_VAL_D shows the true on/off state of the hardware, using XD_STATE. The Invert I/O
option can be used to do a Boolean NOT function between the field value and the output. A discrete
value of zero(0) will be considered to be a logical zero(0) and an non-zero discrete value will be
considered to be a logical (1) e.g. if invert is selected, the logical NOT of a non-zero field value would
result in a zero(0) discrete output, the logical NOT of a zero field value would result in a discrete
output value of one(1).
Filtering and Scaling
PV_FTIME may be used to set the time that the hardware must be in one state before it gets passed
to the PV_D. The PV_D is always the value that the block will place in OUT_D if the mode is Auto. The
PV_D and the OUT_D always have identical scaling. OUT_STATE provides scaling for PV_D.
Supported Modes
O/S, Manual, and Auto modes are supported. If Manual is allowed, someone may write a value to
OUT_D.
Alarm Types
Standard block alarm plus standard discrete alarm applied to OUT_D.
Simulation
Simulation is used to support testing. Simulation can be enabled through the configuration tool and
allows the manual setting of the measurement value through the Simulate parameter (SIMULATE_D).
Alternatively the operator can change the block Mode to Manual and adjust the Output Value.
OUT_D
(Discrete Signal
from Transducer) Discrete Input Block
FIELD_VAL_D
THE CHANNEL
DATA
Simulate
SIMULATE_D
Optional
Invert
Filter
PV_FTIME
PV_D
Alarms
DISC MODE
Output