Rockwell-automation 1746-NI8 SLC 500 Analog Input Modules User Manual Manual de usuario Pagina 49
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- Tabla de contenidos
- SOLUCIÓN DE PROBLEMAS
- MARCADORES
Valorado. / 5. Basado en revisión del cliente
5–8
Channel Configuration, Data, and Status
Publication
17466.8 - April 1997
Scaling Examples
The following scaling examples show how to convert the channel
data word from the configured data type to “real” units. “Real” units
are the values being measured such as temperature and pressure. To
perform the scaling, you must know the defined voltage or current
range for the channel’s input type. The lowest possible value for an
input type is S
LOW
, and the highest possible value is S
HIGH
. Refer to
the Channel Data Word Value tables on pages 5–5 and 5–6 for the
data channel word ranges.
Engineering Units to “Real” Units
Situation #1:
A transducer is being used to measure temperature.
The 4–20 mA signal is proportional to 100–500°C (212–932°F).
The channel data word is in engineering units format.
The channel data = 5500.
Find:
“Real” units equivalent in
°F.
Equation: Real Units Equivalentchannel data value
scaling factor
S
HIGH
S
LOW
input range
where: S
LOW
= 212
°F
S
HIGH
= 932
°F
channel data word = 5500
scaling for engineering units = 1 µ
A per step
Solution: Real Units Equivalent5500
(
1mA
)
932°F212°F
20 mA4 mA
247.5°F
Situation #2:
A transducer is being used to measure temperature.
The 0–10V dc signal is proportional to 0–10°C.
The channel data word is in engineering units format.
The channel data = 5000.
Find:
“Real” units equivalent in
°C.
Equation: Real Units Equivalentchannel data value
scaling factor
S
HIGH
S
LOW
input range
where: S
LOW
= 0
°C
S
HIGH
= 10
°C
channel data word = 5000
scaling for engineering units = 1 mV per step
Solution: Real Units Equivalent5000
(
1mV
)
10°C0°C
10V dc0V dc
5.000°C
" TIP
If you are measuring a “real” voltage or current, then selecting engineering units allows the
module to report “real” values without further scaling. For example, a 4.683V dc signal
would produce a channel data word of 4683.
- SLC 500t 1
- Input Module 1
- AllenBradley 1
- Important User 2
- Information 2
- Table of Contents 3
- Table of Contentsii 4
- Table of Contents iii 5
- Table of Contentsiv 6
- Who Should Use this 7
- Purpose of this Manual 7
- Contents of this Manual 8
- Related Documentation 9
- Common Techniques Used in 10
- AllenBradley Support 10
- Overview 11
- Hardware Features 12
- System Overview 13
- (shown for one channel) 14
- Quick Start 15
- Procedures 16
- sensor cable 17
- 1011 00000000 18
- Program the configuration 19
- 0000 00000000 20
- 1011 00000000000 21
- Installation and Wiring 22
- Module Location in Chassis 23
- Compliance to European 24
- Union Directives 24
- Module Installation and 25
- Module Installation Procedure 26
- Terminal Wiring 27
- Publication 28
- 17466.8 - April 1997 28
- Input Devices 30
- Preliminary Operating 32
- Considerations 32
- Class 1 and Class 3 33
- Interface 33
- Module Addressing 33
- Class 3 Memory Map 34
- O : 4 . 2 35
- I : 4 . 10 35
- Module Update Time 36
- Channel TurnOn, TurnOff 37
- Response to Slot Disabling 37
- Channel Filter Frequency 38
- Selection 38
- Channel Configuration, Data 42
- Channel Configuration 43
- Procedure 43
- Channel Data Word 46
- Scaling the 47
- Scaling Examples 49
- " TIP 49
- Channel Status Checking 52
- 10 V dc 53
- Input Type Status (Bits 0-2) 54
- Channel Status (Bit 11) 54
- Open Circuit Error (Bit 12) 55
- OverRange Error (Bit 13) 55
- UnderRange Error (Bit 14) 55
- Configuration Error (Bit 15) 55
- 1100 00110100 56
- Interfacing to the PID 58
- Instruction 58
- Monitoring Channel Status 59
- Bits (Class 3 Mode Only) 59
- Module Diagnostics and 60
- Troubleshooting 60
- LED Indicators 61
- Module Status LED (Green) 63
- Troubleshooting Flowchart 64
- Replacement Parts 65
- Contacting AllenBradley 65
- Application Examples 66
- Program Listing 68
- Data File 68
- Supplementary Example 69
- 1112131415 71
- 910 8 67450123 71
- Bit Number 71
- Specifications 76
- TTL:Chap 77
- +85°C (-40°F to +185°F) 77
- Configuration Worksheet 78
- Converting from 1746NI4 to 79
- 1746NI8 79
- 1100 01111000 81
- 1100 01100000 81
- Two's Complement Binary 82
- Glossary 84
- GlossaryG–2 85
- Glossary G–3 86
- Worldwide representation 91
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