Rockwell Automation 1785 PLC-5 User Manual Page 74
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Instruction Set
Diagnostic 3-30
Diagnostic Instructions
Instruction Description
File Bit Compare
FBC
Status Bits:
EN - Enable
DN - Done Bit
ER - Error Bit
IN - Inhibit Bit
FD - Found Bit
When the input conditions go from false-to-true, the processor compares the number of bits
specified in the Cmp Control Length (48) of the Source file (#I:031) with the bits in the Reference
file (#B3:1). The processor stores the results (mismatched bit numbers) in the Result file
(#N7:0). File R6:4 controls the compare and file R6:5 controls the file that contains the results.
The file containing the results can hold up to 10 (the number specified in the Length field)
mismatches between the compared files.
FILE BIT COMPARE
Source #I:031
Reference #B3:1
Result #N7:0
Cmp Control R6:4
Length 48
Position 0
Result Control R6:5
Length 10
Position 0
FBC
- Quick Reference 1
- Conventions 4
- Front Panel – Enhanced 5
- PLC-5 Processors 5
- Hardware Components 6
- Front Panel – Ethernet 7
- ControlNet PLC-5 Processors 8
- Front Panel – Classic 9
- Comparison Chart for 10
- PLC-5 Family Processors 10
- Processor Comparison 1-7 11
- Any mix of I/O 11
- Processor Comparison 1-8 12
- Any mix of I/O 12
- Processor Comparison 1-9 13
- Processors 14
- Power Supply Modules 1-11 15
- Power Supplies 1-12 16
- Front Panel Keyswitch 17
- Processor Status File 18
- Processor Status File 1-15 19
- Processor Status File 1-16 20
- Processor Status File 1-17 21
- Processor Status File 1-18 22
- Processor Status File 1-19 23
- Processor Status File 1-20 24
- Processor Status File 1-21 25
- Processor Status File 1-22 26
- Processor Status File 1-23 27
- S:25 Reserved 28
- Processor Status File 1-25 29
- Processor Status File 1-26 30
- Processor Status File 1-27 31
- Processor Status File 1-28 32
- I/O Status File Format 33
- I/O Status File 1-30 34
- I/O Status File 1-31 35
- Addressing Data Table Files 37
- Data Table Files 2-2 38
- Data Table Files 2-3 39
- PLC-5 Memory 39
- Data Table 39
- Program Files 40
- I/O Image Addressing 41
- Logical Addressing 42
- Addressing 43
- N[N7:0] file number 43
- N7:[C5:7.ACC] element number 43
- B3:/[I:017] bit number 43
- I/O Addressing Modes 44
- Addressing Concept Summary 44
- Status Bits 3-1 45
- Relay Instructions 46
- Relay 3-3 47
- Relay 3-4 48
- Timer Instructions 49
- Timer 3-6 50
- Counter Instructions 51
- Counter 3-8 52
- Compare Instructions 53
- Compare 3-10 54
- Compare 3-11 55
- Compute Instructions 56
- Compute 3-13 57
- Compute 3-14 58
- Compute 3-15 59
- Compute 3-16 60
- Compute 3-17 61
- Compute 3-18 62
- Compute 3-19 63
- Compute 3-20 64
- Compute 3-21 65
- Logical Instructions 66
- Logical 3-23 67
- Conversion Instructions 68
- Conversion 3-25 69
- Bit Modify and Move 3-26 70
- Bit Modify and Move 3-27 71
- File Instructions 72
- File Instructions 3-29 73
- Diagnostic Instructions 74
- Diagnostic 3-31 75
- Shift Register Instructions 76
- Shift Register 3-33 77
- Shift Register 3-34 78
- Sequencer Instructions 79
- Program Control Instructions 80
- Program Control 3-37 81
- Program Control 3-38 82
- Program Control 3-39 83
- Program Control 3-40 84
- Processor and Message 3-41 85
- Processor and Message 3-42 86
- Block and 87
- ControlNet 87
- Transfer Instructions 87
- Block Transfer 3-44 88
- Block Transfer 3-45 89
- Block Transfer 3-46 90
- ASCII Instructions 91
- ASCII Instructions 3-48 92
- ASCII Instructions 3-49 93
- ASCII Instructions 3-50 94
- ASCII Instructions 3-51 95
- ASCII Instructions 3-52 96
- Pressed in at bottom 100
- Open (OFF) 100
- Pressed in at top 100
- Closed (ON) 100
- Complementary I/O 4-5 101
- To select: Set switch: To: 103
- Switch Settings 103
- Side View 104
- Ethernet Configuration 106
- NET ADDRESS 107
- Network address 01 107
- Switch Assembly 108
- Classic PLC-5 109
- Switch Assembly 2 4-15 111
- Remote I/O Rack Number 112
- Scanner Module, or VME System 112
- Switch Assembly 2 113
- I/O Rack Number 4-18 114
- (8-word groups) 115
- I/O Rack Number 4-20 116
- I/O Rack Number 4-22 118
- General Problems 5-1 121
- Enhanced, Ethernet 121
- General Problems 5-2 122
- Communication Channel 5-3 123
- Communication Channel 5-4 124
- Communication Channel 5-5 125
- Communication Channel 5-6 126
- Ethernet 5-7 127
- Ethernet PLC-5 127
- Status Indicators 128
- ControlNet 5-9 129
- ControlNet PLC-5 129
- ControlNet 5-10 130
- ControlNet 5-11 131
- General Problems 5-12 132
- General Problems 5-13 133
- Adapter Mode 5-14 134
- Scanner Mode 5-15 135
- Scanner Mode 5-16 136
- I/O RACK 137
- A B 148
- Extended Local I/O 5-29 149
- 1771 I/O ControlNet 149
- Extended Local I/O 5-30 150
- ControlNet I/O Status 150
- Extended Local I/O 5-31 151
- Extended Local I/O 5-32 152
- Extended Local I/O 5-33 153
- Extended Local I/O 5-34 154
- Error Messages 155
- Extended Local I/O 5-36 156
- ControlNet Errors 156
- Extended Local I/O 5-37 157
- Extended Local I/O 5-38 158
- Extended Local I/O 5-39 159
- Extended Local I/O 5-40 160
- Extended Local I/O 5-41 161
- Extended Local I/O 5-42 162
- Extended Local I/O 5-43 163
- Extended Local I/O 5-44 164
- Troubleshooting 165
- Additional Major Fault Codes 166
- ControlNet processor 166
- Extended Local I/O 5-47 167
- Fault Codes 167
- Extended Local I/O 5-48 168
- Extended Local I/O 5-49 169
- Extended Local I/O 5-50 170
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