Page 432 - Programmable Logic Controllers, Fifth Edition - Mobile version

Project window, 92
Rotary switches, 253
Proportional band, for heating application, 312, 312f Return (RET) output instruction, 191 ControlLogix Sequencer Output (SQO) instruction,
258–259, 259f
Proportional control/controllers, 228, 311–315, 311f Rotating cam limit switch, 253f four-step sequencer, 256–257, 257f
derivative action and, 313 Routines, CLX system, 337, 337f mask word, 256–257
droop, 312 Routing, wire, guidelines for, 284–285 moving data through, 256–257, 258f
integral action and, 312 RS-232, 54, 300, 322 moving data from file to output, 257–258, 258f
offset, 312 RS-422, 54, 322 Sequencer menu tab, 255f
steady-state error, 312 RS-485, 322 SQC instruction, 262–263, 264f
Proportional-integral (PI) control, 227 RSLinx software, 299–300, 300f, 334, 335f SQL instruction, 263–264, 265f
Proportional-integral-derivative (PID) control, 227, 228– RSLogix software, 91, 217, 299, 299f, 300, SQO instruction, 255–259, 255–259f
229, 228f, 311–315, 313f 334, 334f Sequencer load (SQL) instruction, 263–264, 265f
fully automatic/intelligent, 315 compute instruction, 235–236 Sequencer Output (SQO) instruction, 255–259, 255–259f
manual, 314 controller organizer tree, 336f control, 256
output instruction and setup screen, 315f counter selection tool bar, 161f destination, 256
response of, 314 Data File screens, 92, 92f file, 255
semiautomatic/autotune, 314–315 instruction toolbar with bit, 91f length, 256
Proportional plus integral (PI) control, 313 I/O Configuration screen, 92, 92f mask, 255–256
Proportioning, time, 312, 312f main window, 91–92, 91f position, 256
Protocol, 319 project, 335 source, 256
Proximity sensors, 104–106f, 104–107 Select Processor Type screen, 92, 92f Sequencer programs, 259–264
application conditions, 104–105 RSWho, 301, 301f, 334 event-driven, 259, 262, 263f
bleeder resistor connected to, 106, 106f RTDs (resistance temperature detectors), 110–111, 110f sequencer chart, 259, 261f
capacitive, 106, 106f RTO timer. see Retentive on-delay (RTO) timer SQC instruction, 262–263, 264f
inductive-type, 105, 105f Rung, 68 SQL instruction, 263–264, 265f
sensing range, 105–106, 106f Run mode, 93 time-driven, 259, 260–261, 261f, 262f
three-wire DC, 105, 105f Sequencer switch, 253–254, 253f
two-wire, 105, 105f cam-operated, 253, 253f, 254
Pulse width modulation, 312 S dishwasher timed, 253–254, 254f
Pumping process, fluid, 143–144, 143f Safety circuitry, 197–200, 198–200f drum-operated, 253, 253f
Pushbutton interlocking, 115, 116f Safety PLCs, 199, 199f operation, 253
Pushbutton switches, 102, 103f vs. standard PLC, 199 Sequential control process, 121, 121f
PV. See Process variable (PV) Safety requirements, 197–198, 198f flow diagram, 121–122, 121f
Same address, program with, 296–297, 296f I/O connection diagram, 122, 122f
R SCADA (supervisory control and data acquisition), 36, ladder logic program for, 122, 123f
relay schematic for, 122, 122f
318, 328–330, 329–330f
Rack-based I/O section, 18, 18f alarm, 329 Sequential function chart (SFC) programming language,
Rack-based memory structures, 75 alert, 329 81, 82, 82f
Rack-based systems, 75 FactoryTalk services platform, 329–330, 330f Sequential time-delayed motor-starting circuit
Rack/slot-based addressing, 19, 19f SCADA/HMI software, 329 hardwired, 147f
vs. tag-based addressing, 19, 21f Scale instruction, 243–244, 244–245f PLC program of, 147f
Radiated noise, 284 Scale with Parameters (SCP) instruction, 30, SERCOS (Serial Real-time Communications System),
Random Access Memory (RAM), 38, 38f 243–244, 245f 327, 328f
Rate of change, PID controllers, 228 Scaling, 30 Serial data communication, 317, 317f, 322, 322f
Reading, 36 Scan, 10 point-to-point link, 317, 317f
Read Only Memory (ROM), 38 Scan cycle time, 78–79 Serial data transmission, 321–322, 321f
Real-time system, PLC as, 2 Scan process, 75–79, 76f Servo drive, motion control process, 316
Real-world devices, 7 data flow, 79, 79f Servo motors, 113, 113f
Reciprocating timers, 147–148 horizontal scan, 81, 81f closed-loop control, 114
CLX system, 365 ladder logic rung conditions, evaluating, 79, 79f motion control process, 316
Recording, data, 39, 39f multiple rung program., 80, 80f open loop control, 113–114, 113f
Redundant processors, 35 patterns, 80–81, 81f Set-point (SP), 228, 309
References, FBD, 385 single rung program, 79–80, 80f Set-point control, 226–227, 227f
Registers, 208 vertical scan, 81, 81f Seven-segment LED display board,
Relay-based control panel, 2, 3f Scan technique, 108, 108f 224, 225f
Relay ladder logic (RLL) program, 7, 92 Scan time, 10 Shift registers, 264–272
diagram for modified process, 11f Scope, defined, 338 bit, 264–272
Relay logic, 2, 7 Seal-in circuits, 114–115, 114–115f circulating shift register function, 265
Relay operation, 99, 99f Security, SCADA, 329 concept of, 265, 266f
Relay schematics Selectable timed disable (STD) instruction, 201, 201f data in, 265
conversion to PLC ladder programs, 121–123 Selectable timed enable (STE) instruction, 201, 201f in material handling processes, 268, 269f
for sequential control process, 122, 122f Selectable timed interrupt (STI) instruction, spray-painting operation, 268–269, 270f
Release coil, 117 200–201, 201f types of, 265, 266f
Reliability, 2, 3f Selection toolbar, timer, 134f Short circuit protection, discrete I/O modules, 34
Remote I/O rack, 18, 18f Selector switch, 103, 103f Sign, 58
Remote mode, 93 Select Processor Type screen, RSLogix 500 software, Signal conditioning, in control system, 308
Repeatability, data communication and, 325 92, 92f Signals, 93–94
Repeater, 318 Self-detection, 292 Sign bit, 49
Reserved (file 1), 75 Semiautomatic/autotune PID control, 314–315 Signed binary numbers, 49t
Reset (RES), 134 Sensing range, proximity sensors, 105–106, 106f Single bit, 83, 224
Resistance temperature detectors (RTDs), Sensors, 28f, 104–111. see also Switches Single-ended PLC application, 13, 13f
110–111, 110f in control system, 308 Single precision, 58
Resolution, analog I/O modules, 34 flow measurement, 111, 111f Single rung program, scan process and, 79–80, 80f
Response time, 3, 4f light, 107–109, 107–109f Single-scan test mode, 93, 289
Result window, 92 magnetic reed switch, 107, 107f Single-step test mode, 93
Retentive on-delay (RTO) timer, 134 position, 111, 111f Sinking inputs, 26, 26f
alarm program, 145–146, 145f proximity, 104–106f, 104–107 Six-axis robot arm, 316f
application, 146 strain/weight, 110, 110f 16-bit word, 48f
CLX system, 364–365, 364–365f temperature, 110–111, 110f Size, PLCs, 12–13, 12f
program, 144–145, 144f ultrasonic, 109–110, 109f memory, 13
timing chart, 145, 145f velocity, 111, 111f SLC 500 controllers, 75, 208
Retentive timer, 144–146 Sequencer chart, 259, 261f addressing format, 86, 86f
Retentive timer reset (RES) instruction, 144 Sequencer compare (SQC) instruction, 262–263, 264f bit level and word level addressing, 19, 20f
Retrieval, data, 39, 39f Sequencer instructions, 255–259, 255f. see also control word, 160–161
Retroreflective scan technique, 108, 108f Instructions counter file, 160, 160f
Index 413

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