Emerson DXP-FF, Инструкция по установке, эксплуатации и обслуживанию

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Appendix E: Discrete Input (DI) Block
Discrete INPUT Blocks (DI Block)
There are 5 Discrete Input Blocks available on the
SCM-FF. The DI block takes the manufacturer’s discrete
input data, selected by channel number, and makes it
available to other function blocks at its output. These DI
blocks become available to the user when linked to one
of the Transducer Channels available for inputs.
A host may retrieve internal information at any time and
alarms are reported as they occur. To make a light come
on or another valve close requires a DI to publish the
information on the bus.
Channels
The 5 DI Function Blocks in the device are associated to
the real world by setting the CHANNEL parameter to the
desired Transducer Channel. Illustration 11 shows the
relationship between Transducer channels and the DI
assigned channels. The output of the DI block (viewed in
the OUT_D parameter) is defined by the DI block’s
CHANNEL assignment. The valid settings for the CHAN-
NEL parameters are listed in Table 7.
By resetting a DI CHANNEL parameter to a different
transducer channel number (0, 6-13, see Table 1) an
end user may customize the functionality of the SCM-FF
to fit a particular application requiring DI’s on temperature
limits and cycle counts instead of the defaults.
Illustration 11.
Channel Assignment for DI Function Blocks
Channels
Valve is Opened/ Valve is Closed 6
Valve is Opened 7
Valve is Closed 8
Auxillary Limit Switch.input 9
Cycle Time Open Alarm (CTOA) 10
Cycle Time Closed Alarm (CTCA) 11
Cycle Count Alarm (CCA) 12
CTOA | CTCA | CCA| TMPH|TMPL 13
Transducer
DI Function Block
Channel = 6
OUT_D
Is Closed
Is Opened
Is Stopped
Is Opening
Is Closing
PV_D
1
2
3
4
5
Channels
Valve is Opened/ Valve is Closed 6
Valve is Opened 7
Valve is Closed 8
Auxillary Limit Switch.input 9
Cycle Time Open Alarm (CTOA) 10
Cycle Time Closed Alarm (CTCA) 11
Cycle Count Alarm (CCA) 12
CTOA | CTCA | CCA| TMPH|TMPL 13
Transducer
DI Function Block
Channel = 6
OUT_D
Is Closed
Is Opened
Is Stopped
Is Opening
Is Closing
PV_D
Channels
Valve is Opened/ Valve is Closed 6
Valve is Opened 7
Valve is Closed 8
Auxillary Limit Switch.input 9
Cycle Time Open Alarm (CTOA) 10
Cycle Time Closed Alarm (CTCA) 11
Cycle Count Alarm (CCA) 12
CTOA | CTCA | CCA| TMPH|TMPL 13
Transducer
DI Function Block
Channel = 6
OUT_D
Is Closed
Is Opened
Is Stopped
Is Opening
Is Closing
PV_D
1
2
3
4
5
Table 1:
DI Channel Parameter Settings List