Flowserve MX FOUNDATION Fieldbus Field Unit Manuale Utente Scaricare il pdf (Pagina 33)

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

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This feature requires the installation of a hardware jumper on the MX/QX FF unit, located on header

X5 Pins 7 and 8.

3.6 Discrete Output (DO) Function Block

The Discrete Output (DO) function block processes a single discrete setpoint and outputs it to a

speciﬁed I/O channel to produce an output signal. The DO block supports mode control, output

tracking, and simulation. There is no process alarm detection in the block. In operation, the DO func-

tion block determines its setpoint, sets the output, and, as an option, checks a readback signal from

the ﬁeld device to conﬁrm the physical output operation.

There are two DO blocks in the Limitorque actuator control system, and three channels:

Chan. No.9 — DO_POSITION_CHAN — Command Stop/Open/Close

Chan. No.10 — DO_ESD_CHAN — Command Emergency Shutdown

Chan. No.11 — DO_RELAY_CHAN — Command energize relays

Figure 3.5 – Discrete Output Function Block

To set the DO block output, the operator ﬁrst sets the mode to deﬁne how the block obtains its

output. In Cascade Mode, the setpoint equals the input value from another block. In Auto Mode, the

setpoint is written to the block. In Manual Mode, the setpoint is written to the Output. In Remote

Cascade Mode, the setpoint is determined by a host computer or DCS that writes to the RCAS input.

Inputs

CAS_IN_D is the remote (cascade) setpoint value from another function block.

RCAS_IN_D is a target setpoint and status provided by a supervisory host to a discrete control or

output block.

Outputs

OUT_D is the discrete output value and status.

BKCAL_OUT_D is the back calculation output value and status required by the BKCAL_IN_D input of

another block for output tracking.

OUT_D

Discrete Output Block

CAS_IN_D

RCAS_IN_D

Setpoint Optional

Invert

Output

MODE

SHED_OPT

SP_D

Optional

Invert

PV_D

Fault State

FSTATE_TIME

FSTATE_VAL_D

Simulate

SIMULATE_D

CHANNEL

DATA

READBACK_D

BKCAL_OUT_D

RCAS_OUT_D

(Transducer)

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 83 84

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Flowserve MX FOUNDATION Fieldbus Field Unit Manuale Utente Pagina 33

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