U90 Ladder Software Manual
viii
Set Coil ......................................................................................................................................................... 161
Reset Coil...................................................................................................................................................... 161
Operands............................................................................................................................................................. 161
Power-up....................................................................................................................................................... 162
Watch Folders............................................................................................................................................... 162
Operand Addressing...................................................................................................................................... 163
Inputs (I) ....................................................................................................................................................... 164
Outputs (O) ................................................................................................................................................... 165
Timers (T)..................................................................................................................................................... 166
Memory Bits (MB) ....................................................................................................................................... 167
Memory Integers (MI) .................................................................................................................................. 167
System Bits ................................................................................................................................................... 168
System Integers (SI)...................................................................................................................................... 169
Assigning an Operand Address by Symbol .................................................................................................. 170
Changing an Operand type............................................................................................................................ 171
Operand Locations List................................................................................................................................. 172
Finding an Operand by symbol..................................................................................................................... 173
Restoring System Symbols ........................................................................................................................... 175
Operands in use............................................................................................................................................. 176
Deleted Unreferenced Operands ................................................................................................................... 177
Operand Values: ........................................................................................................................................... 178
Functions ............................................................................................................................................................ 178
Functions....................................................................................................................................................... 178
Compare Functions....................................................................................................................................... 179
Logic Functions ............................................................................................................................................ 183
Loops ............................................................................................................................................................ 187
Math Functions ............................................................................................................................................. 190
Store Functions ............................................................................................................................................. 198
Time Functions ............................................................................................................................................. 201
Special Functions: without Elements............................................................................................................ 224
Loadcell ........................................................................................................................................................ 262
MODBUS ..................................................................................................................................................... 293
Counter ............................................................................................................................................................... 301
Building a Counter........................................................................................................................................ 301
Timers................................................................................................................................................................. 301
Timers (T)..................................................................................................................................................... 301
Setting Timers............................................................................................................................................... 302
How Timers work ......................................................................................................................................... 304
Store Timer's Preset/Current Value............................................................................................................... 306
Load Timer Preset/Current Value................................................................................................................. 307
Presetting Timers via Keypad....................................................................................................................... 308
Selecting a Timer Display format ................................................................................................................. 309
PID ......................................................................................................................................................................... 311
PID Function ...................................................................................................................................................... 311
About PID and Process Control.................................................................................................................... 311
Inside the PID Function ................................................................................................................................ 312
Defining a PID function................................................................................................................................ 314
PID Function Parameters .............................................................................................................................. 315