Page 431 - Programmable Logic Controllers, Fifth Edition - Mobile version

On-delay timer (TON) (continued)
CLX system, 359–362, 359–362f Photoconductive cell, 107, 107f immediate I/O instructions, 193–194, 194f
Photoelectric sensors, 107–108, 108f
jump instruction, 188–190, 188–190f
control bits, 137–138, 138f Photoresistive cell, 107 master control reset, 185–187f, 185–188
control word, 136 Photovoltaic cell, 107, 107f safety circuitry, 197–200, 198–200f
fluid pumping process, 143–144, 143f PI. See Proportional-integral (PI) control selectable timed interrupt, 200–201, 201f
instruction, 135–140 Pick and Place machines, 315, 315f subroutine functions, 190–193, 190–193f
preset value (PRE) word, 136 PID. See Proportional-integral-derivative (PID) control suspend instruction, 202, 202f
principle of operation, 135, 135f PID module, 32, 32f temporary end, 201, 202f
SLC 500 timer file, 135–136, 136f Pins, FBD, 385, 386f Program files, 75, 76f
SLC 500 timer table, 138, 138f PLC-based control panel, 2, 3f Programmable automation controller (PAC), 12, 12f,
On-delay timer circuit PLC drink-manufacturing program, 216, 216f 333, 333f
normally closed, timed open (NCTO) contact, PLC programming language. see Language Programmable logic controllers (PLCs), 2f
133, 133f PLCs. see Programmable logic controllers (PLCs) abbreviations, 2
normally open, timed closed (NOTC) contact, Plug and play, 325 advantages, 2
132–133, 133f Plug-in terminal block, 22, 22f applications, 2, 12–13, 13f
On-delay timer program, 221–223, 222f Pneumatic on-delay timer, 132f architecture, 4
One-Shot Falling (OSF) instruction Points per module, discrete I/O modules, 34 benefits, 2–4
CLX system, 354, 354f Point-to-point serial communications link, 317, 317f closed architecture, 4
One-Shot (ONS) instruction Polling, 320 communications capability, 3
CLX system, 353–354, 354–355f Position, FAL instruction, 213 defined, 2
up-counter, 162–166, 164f Position control modules, 32, 32f easier to troubleshoot, 3–4
One-shot rising (OSR) instruction, 165–166, 165f Position sensors, 111, 111f faster response time, 3
CLX system, 354, 354f Positive temperature coefficient (PTC), of metals, 110 flexibility, 2
1’s complement number, 49, 50t Power circuit, 100 hardware, 4
Online programming, 289 Power supply, 4, 5, 6f industrial application, 11, 11f
On/off control, 310–311, 310–311f alternating current (AC), 5 instruction set, 14, 14t
On/off PLC control, 228 CPU, 35, 35f I/O system, 4–5, 5f, 6–7, 6f, 7f
i symbol, 10 direct current (DC), 5 lower cost, 2–3
Open architecture, 4 Predefined structures, CLX system, 340, 340f modifying operation, 11, 11f
Open-loop motor control system, 113, 113f programming timers, 358–359, 358f motion control process, 315
Open Systems Interconnection (OSI model), 319–320 Preset counter values, MOV instruction and, open architecture, 4
Optical encoder, 111, 111f 210–211, 211f overview, 1–14
incremental, 173–174, 174f Preset time, 134 parts of, 4–7, 5f
Optical encoder disk, 53–54, 54f Preset timer values, MOV instruction and, 210, 210f power supply, 5, 6f
Optical isolator, 7 Preset value, 136 principles of operation, 8–10f, 8–11
OR function, 63, 63f, 65, 208 counter, 161 processor (CPU), 5–6, 6f
OR gate, 63, 63f Preset value (PRE) word program, 7
OTL instruction. see Output latch (OTL) instruction timers, 136 programming device, 7
OTU instruction. see Output unlatch (OTU) instruction up-counter, 161 programming language, 7
Output actuator, 310 Pressure switches, 104, 104f proprietary, 4
Output branching, 87, 87f Preventive maintenance program, 291, 291f as real-time system, 2
with conditions, 87, 87f Principles of operation, 8–10f, 8–11 relay logic, 2
nested, 87–88, 87f modifying, 11, 11f reliability, 2
Output control devices, 112–113f, 112–114 Process bus networks, 319 size, 12–13, 12f
actuator, 112 Process control, 306. see also Control systems software, 4, 12
operation, 112 centralized, 307, 307f vs. computers, 11–12, 11–12f
servo motors, 113, 113f distributive control system, 307, 308f Programmed logic, hardwired logic vs., 67–68
stepper motors, 113, 113f individual, 306, 307f Programming, 289–291
symbols for, 112f Process control problem, 8, 8f addressing, 86–87, 86f
Output current, discrete I/O modules, 33 ladder logic program, 9–10, 10f analog devices, connecting with, 93–94, 94f
Output current/voltage range(s), analog I/O modules, 34 relay method for, 8–9, 8f bit-level logic instructions, 83–86
Output devices, 7 RUN operation, 10 branch instructions, 87–89, 87f
inputs and, relationships between, 2, 3f wiring connections, 9, 9f, 10–11, 10f Examine If Closed (XIC) instruction, 90–91, 90f
Output Energize (OTE) instruction, 83, 84–85, 85f Process(es). see also Control systems Examine If Open (XIO) instruction, 90–91, 90f
Output file, 75 batch, 306, 306f internal relay instructions, 89, 89f, 90f
Output image table file, 77–78, 77f centralized control, 307, 307f ladder diagram, 91–93, 93f
Output instructions, 216. See also Data transfer continuous, 306, 306f languages, 81–83, 81f
Output latch (OTL) instruction, 117–118, 117–118f control, 306 modes of operation, 93, 93f
CLX system, 352–353, 352–353f discrete manufacturing, 306, 306f offline, 289
Output malfunctions, troubleshooting, 294, 294f, 295f distributive control system, 307, 308f online, 289
Output troubleshooting guide, 299f individual control, 306, 307f processor memory organization, 75–79, 76f
Output unlatch (OTU) instruction, 117–118, 117–118f Processor (CPU), 4, 5–6, 6f data files, 75–78, 77–78f
CLX system, 352–353, 352–353f Processor memory organization, 75–79, 76f program files, 75, 76f
Output voltage, discrete I/O modules, 33 data files, 75–78, 77–78f program scan cycle, 78–81, 78f
Overflow (OV) bit, 160–161 program files, 75, 76f Programming counters. see Counters
Overload (OL) relay, 102 Processor module, 35f, 36f Programming device, 4, 7
function of, 101, 101f CPU section, 35 Programming language. see Language
Override instructions, 185 memory section, 35 Programming terminal devices, 39, 39f
PROG position, 35–36 Programming timers. see Timers
REM Position, 36 Program mode, 93
P RUN position, 35 Program/processor status toolbar, 91–92
PanelView graphic terminals, 309f troubleshooting, 292, 292f Program scan cycle, 78–81, 78f
Parallel data transmission, 321, 321f Process parameters display, 127f CLX system, 345–346, 345f
Parity bit, 54, 55t, 322 Process variable (PV), 228, 309 data flow, 79, 79f
Parking garage counter, 167–168, 168f Produced/consumed tags, 339, 339f horizontal scan, 81, 81f
PASCAL, 81 Product part flow rate program, 177, 177f ladder logic rung conditions, evaluating, 79, 79f
PC. see Personal computer (PC) PROFIBUS-DP, 326–327, 327f multiple rung program., 80, 80f
PC interface card, 21f Program, 7 patterns, 80–81, 81f
Peer-to-peer network, 321, 321f CLX system, 336–337, 337f single rung program, 79–80, 80f
Periodic tasks, 336 data manipulation, 221–224, 221f–223f time, 78–79
Personal computer (PC), 7, 8f, 39 Program control instructions, 184–202. see also vertical scan, 81, 81f
memory, 48, 49f Instructions Program tag, 338
as programmer, 91 fault routine, 201 Project, CLX system, 335–336, 335–336f
vs. PLCs, 11–12, 11–12f forcing external I/O addresses, 195–196f, 195–197 Project tree, 92
412 Index

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