Programmable Logic Controllers 4th Edition

290 Programmable Logic Controllers

Ladder programming, continued program, 84, 91, 92, 109,
multiple outputs, 91 110, 111, 112, 113, 114,
NAND, 88
NOR, 89 115, 134, 138, 194, 250,
NOT, 87 252, 255, 256, 260, 266
OR, 86 pulse operation, 138
principle, 80 shift register, 190, 191
sequenced outputs, 92 subroutine, 156
shift register, 190 timers, 160
symbols, 83, 276 Modular form of PLC, 10
timers, 160 Motor d.c.
XOR, 90 basic form, 34
brushless, 35
LAN, 69 control, 35
Last output set, 222 Motor, stepper, 36
LED, 21 Motorola MPX100AP, 28
Lift, 39
Light-emitting diode, 21 NAND, 87
Limit switch, 20 Negative transition-sensing coil,
Linear variable differential
138
transformer, 26 Network, local area, 69
LINT, 51 Non-linearity error, 17
Liquid level detector, 29, 40 NOR, 88
LM35, 25 NOT, 87
LM3911N, 25
Logic functions, 84, 95, 278 Octal number system, 45
Loop, 20 mA, 65 OMRON
LREAL, 51
LVDT, see Linear variable CPM1A, 11
CX-One, 15
differential transformer One-shot, 137
Open systems interconnection
Machine code, 80, 93
Manufacturing automation model, 72
Operational amplifier, 60
protocol, 73 Optoisolators, 8
MAP, 73 OR, 85
Markers, 132 Orifice flow meter, 29
Mass I/O copying, 75 Output
MelsecNET, 71
MELSOFT, 14, 93 devices, 30
Memory, 7 relay, 9, 57
Mitsubishi transistor, 9, 57
triac, 10, 57
addresses, 77
auxiliary relay, 133 Parallel communication
cascaded timers, 161 principles, 63
counter, 173, 174, 176 standards, 66
data comparison, 200
jump, 154 Parity check, 68
marker, 133 Photoconductive cell, 21
master control relay, 143, 144 Photodiode, 21
MELSEC FX3U, 10, 76 Photoelectric sensors, 21
monitoring, 220 PID control, 205
move, 198, 199 PLC, see Programmable logic

controller

Index 291

Position sensor, 26 RS422, 65
Positive transition sensing coil, RS423, 65
RSLogix, 93
138 RTD, 24
Potential divider, 60
Potentiometer, 26 SAA 1027, 38
Pressure sensors, 28 Safe systems, 214
Process control, 269 SCADA, 72
Programmable logic controller Scientific notation, 51
Sensitivity, 18
advantages, 3 Sensor, 17
architecture, 5 Sequencer, 180
continuous updating, 75 Sequential function chart
cycle, 75
function, 3 actions, 119
I/O processing, 53, 75 and flow charts, 210
input units, 53 convergence, 117
internal relays, 132 equivalent ladder, 117, 119
linking, 62 parallel branching, 117
mass I/O copying, 75 principles, 116
output units, 56 process control, 269
programming, 14, 80 sequencing, 250
safety, 218 selective branching, 117
timers, 159 states, 116
types, 10 steps, 116
Proportional control, 204 symbols, 279
Protocols, 64, 68 transitions, 116
Proximity switches, 20 Serial communication
Pseudocode, 210 principles, 63
Pulse width modulation, 34 RS232, 64
standards, 63
Rack form of PLC, 10 Set/reset, 138
RAM, 7 Settling time, 18
Range, 18 Shift register
REAL, 51 IEC 1131-3 symbol, 192
Reed switch, 21 principles, 189
Registers, 6, 189, 197 Siemens
Relay addresses, 77
arithmetic operations, 203
battery-backed, 136 BCD/binary, 202
internal, 132 counter, 173, 174, 178
master control, 142 data comparison, 200
output device, 30 flags, 133
retentive, 136 jump, 155
Reliability, 19 move, 199
Remote connections, 62 program, 84, 92, 96, 109,
Replication, 224
Resistive temperature detector, 24 110, 111, 112, 113, 114,
Response time, 18 134, 141, 240, 252, 256,
Retentive memory coil, 136 260, 266
Rise time, 18 set/reset, 140, 141
Robot, 39 shift register, 192
ROM, 7 STEP 7, 14, 93
RS232, 64

292 Programmable Logic Controllers

Siemens, continued Thermodiode, 24
subroutine, 156 Thermotransistor, 24
timers, 160, 163, 164 Time representation, 51
Timers
Signal
conditioning, 59 cascaded, 161
lamp program, 100, 114 IEC 1131-3, 159
off-delay, 159, 163
Simulation, 220 on-delay, 159
SINECL, 71 on-off cycle, 162
Sinking, 10, 53, 56 pulse, 159, 165
Smart sensors, 30 programming, 160
Sourcing, 10, 53, 56 sequencing with, 161
Stability, 19 types, 159
STEP 7, 93 TIWAY, 71
Stepper motor Toshiba, 133, 141, 160, 162, 174,

action, 36 181, 191
bipolar, 38 Traffic lamp sequence, 115, 167
hybrid, 37 Transducer, 17
permanent magnet, 36 Truth table, 85
unipolar, 38 Twister-pair cabling, 63
variable reluctance, 37
Stop switches, 102, 215 UDINT, 51
Strain gauges, 27, 61 UINT, 51
Structured text ULINT, 51
assignment, 120 USINT, 51
conditional statements, 122
data comparison, 200 Valve
iteration statements, 122 actuation, 32
language, 120 control positions, 32
move, 198 directional control, 31
operators, 121 operation program, 100, 115
symbols, 280 ports, 32
traffic lights, 167 sequencing, 145, 176, 193,
Subroutine, 156 254, 256
Switch sensors, 19 solenoid operated, 31
spool, 31
TEDs, 30 symbol, 32
Telemecanique, 15, 108, 133, 139,
Watchdog timer, 221
141, 160 Wheatstone bridge, 24, 27, 61
Temperature Word, 7, 51, 197

control, 250 XOR, 89
sensors, 24
Testing, 218
Texas Instrument TSL220, 22
Thermocouple, 25