User`s guide

Appendix A - Logic Application Examples
Overview
224 UMC800 Control Builder User’s Guide Release E
1/01
What’s in this section?
The following Examples are covered in this section.
Topic See Page
• Basic PLC Ladder Logic
− Example 1 Basic Series Circuit
− Example 2 Basic Series-Parallel Circuit
− Example 3 Series-Parallel Circuit expanded to include a Normally Closed
Contact in series with the series-parallel circuit
− Example 4 Extension of Example 3 to include more permissive limit switch and
pressure switch contacts, plus a second output to turn on a panel
lamp
− Example 5 Free Form Logic-Boolean Expressions
225
225
226
226
227
228
• Basic Start/Stop Circuit Example 229
• Motor Starters with Permissives 230
• On and Off Delay Timers
− Example 1 Basic Start/Stop circuit with On Delay Timer
− Example 2 Using On Delay Timers for Time Duration
− Example 3 Using Off Delay Timers for Time Duration
231
231
232
232
• Retentive Timers/Counters 233
• Furnace Relay Ladder Logic Conversion Example 234
• Loop and Logic Integration
− Example 1 Series-Parallel Circuit expanded to include a Normally Closed
Contact in series with the series-parallel circuit and includes
interaction with statuses from the control loop and SP Programmer
events
− Example 2 Control OFF of the Lowest of 3 Thermocouples
235
235
235