Introduction to Industrial Automation

 

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 Index

RS 485 connection, 249, 249f

RTD (resistor temperature detectors), 58, 59, 60, 61–62

S

SCADA (supervisory control and data acquisition) 

systems, 368–369, 370f

“Scanning” mode, PLC, 197–198

Schematic circuits, 11

Secondary circuits, 11

Secondary RLO (S.RLO), 288

in Boolean program, 305–306, 306f

Seebeck phenomenon, 60

Selector switches, 205

Self-holding ON-delay timer, 317

Self-holding pulse timer, 317

Self-latching contact

defined, 80

principle, 122

Semiconductor sensor, 62

Sensing distance (SD), of proximity switch, 44

Sensors, 37–64, 205

automation circuits with, 98–102

of garage door, 101–102

level control, pump operation based on, 100

machine with canceling ability, 98–100

operation of two pumps according to demand, 

100–101

digital and analog, 5

flow switches, 57–59

paddle-type liquid, 57, 58f

infrared temperature, 61

level switches, 52–57

capacitive, 53–54

electronic, for conductive liquids, 52–53

float, 56

optical, 57

radar-type, 55

ultrasonic, 54–55

limit switches, 50–52

overview, 37–38

photoelectric switches, 47–50

dark-on and light-on operation of, 49, 50t

defined, 47

diffuse-reflective, 49

exterior view, 47f

retro-reflective, 48–49

through-beam, 47–48

types, 47

proximity switches, 40–47

advantages, 40

applications, 46–47

basic exterior forms, 42f

capacitive, 42, 43

detection/sensing distance, 40

effects of target size and metallic environment, 

44, 45f

electric connection, 43–44

inductive, 42

magnetic, 40, 44–45, 46f

magnetoresistive, 45–46

object placement distance, 41

operating frequency, 41

operating principles, 40

parameters, 40–42

power supply, 41

residual current, 41

response time, 41

types, 40, 42

state diagrams with, 124–128

examples, 124–128

pushbuttons and sensor, machine operation by, 

124–126

three-speed machine automation, 126–128

temperature and pressure switches, 59–64

bimetal, 59–60

overview, 59

pressure sensing elements for motion production, 

62f

RTD, 60, 61–62

semiconductor sensor, 62

thermocouples, 60

thermal overload relays, 38–40

Separating similar balls, arrangement for, 178–179

Sequential automation systems, 142–145

Sequential Function Chart (SFC) language, 142, 272, 

276–277, 276f, 277f

Sequential start, latch of machines (chain latch), 93, 94f

Servomotors, 22

Set point, 373, 374f

SFC language, see Sequential Function Chart (SFC) 

language

Shearing machine, of unfolded aluminum sheet, 401, 

401f

Shielding (electromagnetic), of cables

PLC installation and, 251–252, 252f

purpose, 251

types, 251

Shunt trip coil, defined, 72

Siemens Step7© software, 296

Signaling, of machine operation/faults, 83f

Simple robotic station, for receiving and stacking light 

objects, 395–396, 396f

Single-acting cylinders, 163–164

Slew range, 23

Solenoid actuators, specific, 71–72

Solenoid linear actuators, 35–37

Solenoids of electrovalves, 211

Solid state relays (SSRs), 32–33

SPDT contacts

flow switches, 57, 59

output, 41, 42, 43, 47, 52, 54, 57

photoelectric switches, 49

for several numbers of poles, 35f

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