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Allen-Bradley MicroLogix 1400 User Manual

Allen-Bradley MicroLogix 1400
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Publication 1766-RM001A-EN-P - October 2008
Table of Contents 7
EQU - Equal
NEQ - Not Equal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191
GRT - Greater Than
LES - Less Than . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191
GEQ - Greater Than or Equal To
LEQ - Less Than or Equal To . . . . . . . . . . . . . . . . . . . . . . . . 192
MEQ - Mask Compare for Equal . . . . . . . . . . . . . . . . . . . . . 193
LIM - Limit Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
Chapter 10
Math Instructions Using the Math Instructions . . . . . . . . . . . . . . . . . . . . . . . . . 198
Updates to Math Status Bits . . . . . . . . . . . . . . . . . . . . . . . . . 200
Using the Floating Point (F) Data File . . . . . . . . . . . . . . . . . . 201
ADD - Add
SUB - Subtract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
MUL - Multiply
DIV - Divide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
NEG - Negate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
CLR - Clear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
ABS - Absolute Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
SCL - Scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
SCP - Scale with Parameters . . . . . . . . . . . . . . . . . . . . . . . . . 209
SQR - Square Root . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211
SIN - Sine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211
COS - Cosine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214
TAN - Tangent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216
ASN - Arc Sine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218
ACS - Arc Cosine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220
ATN - Arc Tangent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221
DEG - Radians to Degrees . . . . . . . . . . . . . . . . . . . . . . . . . . 223
RAD - Degrees to Radians . . . . . . . . . . . . . . . . . . . . . . . . . . 225
LN - Natural Log. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227
LOG - Base 10 Logarithm . . . . . . . . . . . . . . . . . . . . . . . . . . . 229
XPY - X Power Y . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231
CPT - Compute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234
Chapter 11
Application Specific
Instructions
RHC - Read High Speed Clock . . . . . . . . . . . . . . . . . . . . . . . 237
RPC - Read Program Checksum . . . . . . . . . . . . . . . . . . . . . . 239
TDF - Compute Time Difference. . . . . . . . . . . . . . . . . . . . . . 240
Chapter 12
Conversion Instructions Using Decode and Encode Instructions . . . . . . . . . . . . . . . . . 243
DCD - Decode 4 to 1-of-16 . . . . . . . . . . . . . . . . . . . . . . . . . 244
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Allen-Bradley MicroLogix 1400 Specifications

General IconGeneral
Processor32-bit
Expansion ModulesUp to 7 expansion I/O modules
Power Supply24V DC or 120/240V AC
Programming SoftwareRSLogix 500
Communication PortsEthernet, RS-232/RS-485 combo port
Controller TypeProgrammable Logic Controller (PLC)
SeriesMicroLogix
Digital Outputs12
Analog Inputs6 (embedded)
Analog Outputs2 (embedded)
High-Speed Counter6 high-speed counters
Pulse Output2 (embedded)
Ethernet PortYes

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