Contents
Function Block Reference Guide 3/99x
Figure 2-48 Duplex Control Example__________________________________________________ 154
Figure 2-49 Cascade Control Example _________________________________________________ 155
Figure 2-50 Ratio Control Example ___________________________________________________ 156
Figure 2-51 Cascade Control of a Boiler Drum Level - Basic _______________________________ 157
Figure 2-52 Cascade Control of a Boiler Drum Level - 3 Element Feedwater Control ____________ 158
Figure 2-53 PT Function Block Example _______________________________________________ 161
Figure 2-54 RCON Function Block Example____________________________________________ 163
Figure 2-55 RCP Function Block Example______________________________________________ 165
Figure 2-56 RH Function Block Example_______________________________________________ 167
Figure 2-57 ROC Function Block Responses _____________________________________________ 170
Figure 2-58 ROC Function Block Example ______________________________________________ 170
Figure 2-59 RSW Function Block Example _____________________________________________ 172
Figure 2-60 Timing Diagram for Resettable Timer ________________________________________ 174
Figure 2-61 SCB Function Block Examples_____________________________________________ 176
Figure 2-62 SPEV Function Block Example ____________________________________________ 179
Figure 2-63 PID with Setpoint Programmer and Guaranteed Soak____________________________ 185
Figure 2-64 PID with Setpoint Programmer and Event Outputs______________________________ 186
Figure 2-65 Alternate Methods for Actuating SP Programmer START, HOLD, and RESET Functions187
Figure 2-66 Using the Setpoint Programmer AUX Output__________________________________ 188
Figure 2-67 Controlled Restart after Power Loss _________________________________________ 189
Figure 2-68 Setpoint Scheduler Function Block Suite______________________________________ 193
Figure 2-69 SQRT Function Block Example_____________________________________________ 197
Figure 2-70 SUB Function Block Example _____________________________________________ 200
Figure 2-71 4SUB Function Block Example ____________________________________________ 201
Figure 2-72 SW Function Block Example ______________________________________________ 203
Figure 2-73 SYNC Function Block Example ____________________________________________ 205
Figure 2-74 TAHD Function Block Example____________________________________________ 207
Figure 2-75 TGFF Function Block Example ____________________________________________ 208
Figure 2-76 TOT Function Block Examples_____________________________________________ 211
Figure 2-77 TPO Function Block Example______________________________________________ 213
Figure 2-78 TPSC Function Block Example _____________________________________________ 229
Figure 2-79 TRIG Function Block Example_____________________________________________ 230
Figure 2-80 UPDN Function Block Example ____________________________________________ 232
Figure 2-81 VLIM Function Block Example ____________________________________________ 234
Figure 2-82 WCON Function Block Example ___________________________________________ 236
Figure 2-83 WTUN Function Block Example ___________________________________________ 238
Figure 2-84 WVAR Function Block Examples __________________________________________ 240
Figure 2-85 XFR Function Block Example _____________________________________________ 242
Figure 2-86 XOR Function Block Example _____________________________________________ 243