Flowserve MX FOUNDATION Fieldbus Field Unit Instrukcja Użytkownika Pobierz pdf (Strona 32)

MX/QX FOUNDATION Fieldbus Field Unit FCD LMENIM2330-01 – 08/11

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

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 83 84

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Flowserve MX FOUNDATION Fieldbus Field Unit Instrukcja Użytkownika Strona 32

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