Flowserve MX FOUNDATION Fieldbus Field Unit - Manual (Page 49)

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MX/QX FOUNdaTION Fieldbus Field Unit FCd LMENIM2330-01 – 08/11
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Channel 8 – Read Discrete Output
The Channel 8 Discrete Input function block, DI_READ_DISC_OUTPUT_CHAN allows the fieldbus
user to monitor the state of up to eight latching relays, S1a, S1b, S2a, S2b (standard) & R1-R8
(optional). These relays control external equipment, and the feedback inputs are available to other
function blocks. The four latching relays are configurable to be set when certain events happen, as
discussed in Section 4.12, Status and Alarm Contacts in Installation and Operation Manual Bulletins
LMENIM2306 for the MX and LMENIM3306 for the QX. The relays can be configured to trip, for
example, when the valve reaches the OPEN and CLOSED positions. This channel is formatted in bit
string format such that each bit represents the readback of a single discrete output.
The configuration may be changed to DDC CONTROLLED, in which case the fieldbus user can change
the state of the contacts over the network using Channel 11.
Channel 8 DI_READ_DISC_OUTPUT_CHAN Terminal # Digital Ouput Value
Discrete output number 1 44,45 State of S1 or R1 (opt) Bit 0
Discrete output number 2 46,47 State of S2 or R2 (opt) Bit 1
Discrete output number 3 48,49 R3 (opt) Bit 2
Discrete output number 4 50,51 R4 (opt) Bit 3
Discrete output number 5 36,37 R5 (opt) Bit 4
Discrete output number 6 38,39 R6 (opt) Bit 5
Discrete output number 7 40,41 R7 (opt) Bit 6
Discrete output number 8 42,43 R8 (opt) Bit 7
Channel 9 - Position
The Channel 9 Discrete Output function block, DO_POSITION_CHAN provides three outputs to the
actuator to either Stop, Open, or Close. It also provides three status values, read back from the
actuator, indicating:
• The actuator has stopped
• The actuator is opening or opened
• The actuator is closing or closed
Discrete Output function block, DO_POSITION_CHAN, will only function when the actuator has been
locally configured to be in Open/Close mode, as can be selected in the setup menus documented in
Installation and Operation Manual Bulletins LMENIM2306 for the MX and LMENIM3306 for the QX.
Channel 9 DO_POSITION_CHAN Value
Valid values to write to this block
Stop
0x00
Open 0x01
Close 0x02
Readback on the DO_POSITION_CHAN
Stop
0x00
Opening / Opened 0x01
Closing / Closed 0x02