Rockwell-automation 1771-OFE/B Analog Output Module User Manual User Manual Page 76
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C-2
Table C.A
BCD Representation
Place Value
2
3
(8) 2
2
(4) 2
1
(2) 2
0
(1)
Decimal
Equivalent
Signed-magnitude binary is a means of communicating numbers to
your processsor. It should be used with the PLC-2 family when
performing computations in the processor. It cannot be used to
manipulate binary 12-bit values or negative values.
Example: The following binary number is equal to decimal 22.
10110
2
= 22
10
The signed-magnitude method places an extra bit (sign bit) in the
left-most position and lets this bit determine whether the number is
positive or negative. The number is positive if the sign bit is 0 and
negative if the sign bit is 1. Using the signed magnitude method:
0 10110 = +22
1 10110 = -22
SignedĆmagnitude Binary
- 1
- 1
- Important User Information 2
- 3
- SOC-2 Summary of Changes 4
- Manual's Purpose 5
- Audience 5
- Vocabulary 5
- Manual Organization 5
- Related Products 6
- Product Compatibility 6
- Related Publications 6
- 7
- Chapter 4 8
- Chapter 5 8
- Chapter 6 8
- Chapter 7 8
- Specifications 9
- Block Transfer with 9
- MiniĆPLCĆ2 and PLCĆ2/20 9
- Processors 9
- Table of Contents 10
- Overview of the Analog Output 11
- How Analog Modules 13
- Communicate with 13
- Programmable Controllers 13
- Accuracy 13
- Chapter Summary 13
- 15
- Calculating Power 16
- Requirements 16
- Determine Module 17
- Location in the I/O Chassis 17
- Setting Module 17
- Configuration Jumpers 17
- • the module faults 19
- Install the Keying Bands 21
- Install the Module and Field 22
- Wiring Arm 22
- Connect the Wiring 23
- Ground the Chassis and 24
- Interpreting the Indicator 25
- Configuring Your Output 27
- Configuration Word 29
- Default Configuration 30
- Data Format 30
- Scaling Value Polarity 32
- Figure 3.3 33
- Procedure for Configuring 35
- Your Module 35
- 37
- Block Transfer 38
- Programming Ć PLCĆ2 38
- Family Processors Only 38
- PLC-2 Family Example Program 39
- Table 4.A 40
- Data Table Map 40
- Data Table MAP (128Ćword) 40
- Table 4.B 41
- PLCĆ2 Family Data Table Word 41
- Programming Ć PLCĆ3 42
- Figure 4.4 43
- Programming Ć PLCĆ5 44
- Other Programming 46
- Considerations 46
- Timer/Counter 48
- Accumulated Values 48
- System Expansion 49
- Recommendations Ć PLCĆ2 49
- Processors Only 49
- 51
- Calibrating Your Output 53
- Voltage Output Version 54
- (1771ĆOFE1) 54
- Figure 6.1 55
- Figure 6.2 55
- Figure 6.3 56
- Current Output Version 57
- (1771ĆOFE2) 57
- Channel Calibration 58
- Figure 6.5 59
- Figure 6.6 60
- Location of Resistor Pots 60
- Table 6.C 60
- Resistor Pots 60
- (1771ĆOFE3) 61
- Figure 6.7 62
- Diagnostics and 65
- Troubleshooting 65
- Read Block Transfer 66
- Status Words 66
- 69
- Appendix 71
- Rungs 2 and 3 72
- Rung Summary 72
- Setting the Block Length 73
- (Multiple GET Instructions 73
- Data Table Formats 75
- SignedĆmagnitude Binary 76
- Two's Complement Binary 77
- Table of Contents 80
- AllenĆBradley 81
- Publication Problem Report 81
- BUSINESS REPLY MAIL 82
- Support Services 83
- Worldwide representation 84
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