Page 430 - Programmable Logic Controllers, Fifth Edition

LiveData, SCADA, 329
size, 13, 37f
Local area network (LAN), 317–318, 317f single bit, 83 HART, 328, 328f
industrial networks, functionality levels, 318, 318f
Lockout/tagout devices, 291f types, 37–38, 38f I/O bus networks, 319
Logic, 82 utilization, 37 LAN, 317–318, 317f
Logical continuity, 79, 86f volatile, 37 master/slave network, 320–321, 320f
Logic gate, 62, 62f Memory map, 75 Modbus, 326, 326f
truth tables, 62 Memory section, processor module, 35 OSI model, 319–320
Logic gate circuits Memory structures, 75 peer-to-peer network, 321, 321f
Boolean equation for, 66–67, 67f rack-based, 75 process bus networks, 319
from Boolean expression, 66, 66f tag-based, 75 PROFIBUS-DP, 326–327, 327f
Logic operators, 65f, 66f Menu bar, 91 SERCOS, 327, 328f
Logic wiring error, 2 MEQ. See Masked Comparison for Equal (MEQ) star topology, 318, 318f
LogixDesigner, 334, 335f Metal oxide varistor (MOV) surge suppressor, token passing network, 320, 320f
LSB (least significant bit), 48 287–288, 288f Network protocol, 319
MicroLogix controller, 78, 78f Network scanner, 323
addressing, 87 Node, 318
M high-speed up-counter instruction, 178, 178f Noise, electrical, 284–285, 284f
Magnetic reed switch, 107, 107f Microprocessor, 35 Noise suppression, 284, 284f
Magnitude, PID controllers, 228 Modbus, 326, 326f Nominal current per input, discrete I/O modules, 33
Main ladder program (file 2), 75 Mode, FAL instruction, 213 Nominal input voltage, discrete I/O modules, 33
Main routine, CLX system, 337 Modes of operation Nonretentive on-delay timer (TON), 144
ladder logic program and, 348–350, 348–350f program mode, 93 Nonvolatile memory, 37–38
Maintenance, preventive, 291, 291f remote mode, 93 NOR gate symbol, 64, 64f
Main window, RSLogix 500 software, 91–92, 91f run mode, 93 Normally closed, timed closed (NCTC) contact
Mantissa, 58 test mode, 93 off-delay timer circuit, 134, 134f
Manually operated switches, 102–103, 103f three-position keyswitch, 93f Normally closed, timed open (NCTO) contact
dual in-line package (DIP) switches, 103, 103f Modular I/O, 4–5, 6f on-delay timer circuit, 133, 133f
pushbutton switches, 102, 103f Module-defined structures, CLX system, 340–341, 340f Normally closed (NC) contacts, 99, 100f
selector switch, 103, 103f Modules. see also I/O modules Normally closed (NC) pushbutton, 102
Manual mode, water level control process in storage combination I/O, 21 Normally open, timed closed (NOTC) contact
tank, 118 Modulo (MOD) instruction, 242, 242f on-delay timer circuit, 132–133, 133f
Manual PID control, 314 Monitor, HMI, 41, 41f Normally open, timed open (NOTO) contact
Masked Comparison for Equal (MEQ), 217, 220–221, Monitoring, 289–291 off-delay timer circuit, 133, 133f
220f, 221 Monitor tags, CLX system, 342, 342f Normally open (NO) contacts, 99, 100f
Masked Move (MVM) instruction, 208, 209–210, 209f Most significant bit (MSB), 48, 49 Normally open (NO) pushbutton, 102
Master control relay (MCR), 198–199, 282–284 Motion control modules, 32, 32f Not equal (NEQ) instruction, 217, 217f
hardwired electromechanical, 282–284, 283f Motion control system, 315–316 NOT function, 64, 64f, 65, 208
Master control reset (MCR) instruction, 185–187f, bottle-filling process, 315, 316f Number systems and codes, 46–58
185–188 Motion module, 316 ASCII code, 54, 55t
Master/slave network, 320–321, 320f Motor-driven analog proportional control valve, 311f binary arithmetic, 55–57
Math instructions, 234–246 Motor lock-out program, 176–177, 176f binary coded decimal (BCD) system, 51–53,
addition, 236–237f, 236–238 Motor seal-in circuit, 115f 52–53f, 52t
clear, 243, 243f Motor starters, 101–102, 102f binary system, 47–48f, 47–49
CLX system, 374–376, 374–376f, 380–382, 380–382f Move (MOV) instruction, 208, 209, 209f comparisons, 47t
Compute/Math menu tab, 235, 235f CLX system, 379–382, 380–382f decimal system, 47, 47f
convert from BCD (FRD), 243, 243f variable preset counter values, 210–211, 211f floating point arithmetic, 57–58, 57–58f
convert to BCD (TOD), 243, 243f variable preset timer values, 210, 210f Gray code, 53–54, 53t, 54f
division, 235, 240–242, 241f Move/Logical menu tab, 208, 208f hexadecimal system, 50–51, 51t
file arithmetic operations, 245–246, 245–246f MSB (most significant bit), 48, 49 negative numbers, 49–50t
multiplication, 235, 239–240, 239–240f Multibit digital devices, 224 octal system, 49–50, 50f, 50t
negate, 242–243, 243f Multiple rung program, scan process and, 80, 80f parity bit, 54, 55t
overview, 235 Multiplication, 55, 57 Numerical data I/O interfaces, 224–226
scale, 243–244, 244–245f Multiplication instruction, 235, 239–240, 239–240f analog devices, 224
SLC 500 CPT (compute) instruction, 235–236, 235f Multitask PLC application, 13 multibit digital devices, 224
square root, 242, 242f MVM. See Masked Move (MVM) instruction Numeric Mode, FAL instruction, 213
subtraction, 235, 238–239, 238f Numeric values, comparison, 216, 216f. See also
word-level math instructions, 242–244 Data comparison
Matrix limitation diagram, 88 N
Matrix-style sequencer chart, 259, 261f NAND gate symbol, 64, 64f O
Mechanical counters, 157, 157f National Electrical Code (NEC), 285–286
Mechanically operated switches, 103–104, 103–104f National Electric Manufacturers Association (NEMA), Octal numbering system, 47t, 49–50, 50t
level switches, 104, 104f 102, 282 conversion to binary number, 50f
limit switch, 103, 103f Negate (NEG) instruction, 242–243, 243f conversion to decimal number, 50f
pressure switches, 104, 104f Negative numbers, 49, 49t, 50t numeric values, 52t
temperature switch/thermostat, 103–104, 104f NEMA 12 enclosure, 282 Odd parity bit, 54, 55t
Mechanical sequencers, 253–254, 253f NEQ. See Not equal (NEQ) instruction Off-delay timer (TOF), 134
cam-operated, 253, 253f, 254 Nested branching, 87–88, 87f CLX system, 362–363, 362–363f
dishwasher timed sequencer switch., 253–254, 254f contact program, 88f fluid pumping process, 143–144, 143f
drum-operated, 253, 253f program to eliminate, 88, 88f hardwired TOF relay circuit, 142–143, 142f, 143f
operation, 253 Nested contact program, 88f instruction, 140–144
Mechanical timing relays, 132–134, 132f Nested subroutines, 191, 193, 193f operation, 140–141, 141f
Memory Network communications. see also Data communications for switching motors off, 141–142, 142f
capacity measurement, 13 access method, 320 Off-delay timer circuit
CLX system, 334, 334f bit-wide bus networks, 319 normally closed, timed closed (NCTC) contact.,
design, 36–37, 37f bridges, 320 134, 134f
EEPROM, 38, 38f bus topology, 318–320, 319f normally open, timed open (NOTO) contact, 133, 133f
EPROM, 38 byte-wide bus networks, 319 Offline programming, 289
factors, 13 ControlNet, 325, 325f OFF position, water level control process in storage
flash, 38, 38f Data Highway, 322, 322f tank, 118
location, 37 device bus networks, 319 OL relay. see Overload (OL) relay
nonvolatile, 37–38 DeviceNet, 322–325, 323–324f On-delay timer (TON), 134
organization of, 48 EtherNet/IP, 325, 326f acumulated value (ACC) word, 136
RAM, 38 Fieldbus, 326, 327f application, 137, 138, 139f
ROM, 38 gateways, 320 automatic sequential control systems, 138, 140, 140f
Index 411

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