Flowserve MX/QX Profibus DP/PA Field Unit Manual de usuario descargar pdf (Pagina 50)

PB DPV1 / PA Field Unit Installation and Maintenance FCD LMENIM2336-03 – 12/12

3.6 Discrete Output (DO) Function Block

The Discrete Output (DO) block accepts a “command” value from the network user. This command

value ﬂows through the DO block algorithm. The DO block then provides this “command” data to the

transducer block, and the actuator takes some action based on this “command.” The function block

also provides readback data allowing the network user to conﬁgure closed-loop control processes.

The DO block supports mode control and simulation.

There are two DO blocks in the MX/QX actuator device. Each DO function block can be assigned to

one of the following channels:

Channel Channel Name Description

354 DO_POSITION_CHAN Command Stop/Open/Close

355 DO_ESD_CHAN Command Emergency Shutdown

356 DO_RELAY_CHAN Command Energize Relays

NOTE: Please note that the quality status bit must be set to “good”, prior to or while sending

command data. This is required in order for the actuator to respond to DO block commands. See

“Status Bit Deﬁnitions” section on page 70 for coding of quality status bits.

Figure 3.10 – Summary of the Parameters of the Discrete Output Function Block

Function

Block

SP_D

READBACK_D

OUT_D

Standard Conﬁguration Parameters

(Acyclic Data)

Example: CHANNEL

INVERT

Process Parameter

(Cyclic Data)

}

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Flowserve MX/QX Profibus DP/PA Field Unit Manual de usuario Pagina 50