Siemens Simatic S7 Series

Index
S7-200 SMART
System Manual, 09/2015, A5E03822230-AC
719
N
Network communications, 26
Networks (communication)
addresses, 397
biasing and terminating the network cable, 403
biasing cable, 404
calculating network distances, 401
general guidelines for building, 400
network configurations, 395
safety concerns, 400
sample RS485 network configurations, 399
selecting the network cable, 402
single-master PPI, 399
types of communication, 22, 353
NEXT, 300
Non-fatal error effect on run-time execution, 110
Non-fatal PLC errors
compile and run-time, 657
Special Memory locations, 660
Non-volatile memory, 78
NOP, 161
Normally closed contact
immediate, 151
standard, 149
Normally open contact
immediate, 151
standard, 149
NOT (STL), 156
Number value to string conversion instructions, 208
O
O (STL-OR), 149
OB< (STL-OR compare byte less than), 192
OB<= (STL-OR compare byte less than or equal), 192
OB<> (STL-OR compare byte not equal), 192
OB= (STL-OR compare byte equal), 192
OB> (STL-OR compare byte greater than), 192
OB>= (STL-OR compare byte greater than or
equal), 192
OB1, 87
OD< (STL-OR compare double word less than), 192
OD<= (STL-OR compare double word less than or
equal), 192
OD<> (STL-OR compare double word not equal), 192
OD= (STL-OR compare double word equal), 192
OD> (STL-OR compare double word greater than), 192
OD>= (STL-OR compare double word greater than or
equal), 192
OI (STL-OR immediate), 151
OLD (STL stack-OR Load), 154
ON (STL-OR NOT), 149
ONI (STL-OR NOT immediate), 151
Open loop control, 481
Opening earlier STEP 7-Micro/WIN projects, 90
Operating mode
changing to RUN, 36, 84
changing to STOP, 36, 84
startup options, 128
Operator stations, 85
Options
STL status, 459
OR< (STL-OR compare real less than), 192
OR<= (STL-OR compare real less than or equal), 192
OR<> (STL-OR compare real not equal), 192
OR= (STL-OR compare real equal), 192
OR> (STL-OR compare real greater than), 192
OR>= (STL-OR compare real greater than or
equal), 192
ORB (STL-OR byte), 294
ORD (STL-OR dword), 294
Ordering information, 705
ORW (STL-OR word), 294
OS<> (STL-OR string compare not equal), 196
OS= (STL-OR string compare equal), 196
Output image register, 56
Outputs
coils, 158
example bit logic, 163
physical and in program, 55
set and reset bits, 159
set and reset dominant bistable, 160
writing, 57
Overvoltage, 568
OW< (STL-OR compare word less than), 192
OW<= (STL-OR compare word less than or equal), 192
OW<> (STL-OR compare word not equal), 192
OW= (STL-OR compare word equal), 192
OW> (STL-OR compare word greater than), 192
OW>= (STL-OR compare word greater than or
equal), 192
P
Password
lost or forgotten, 146
privilege levels, 124
Password protection, 124
PC/PPI cable, 402
PID auto-tune
auto-deviation, 472
auto-hysteresis, 472
exception conditions, 475