Index
S
S (%), references, 7
Scan time, effect of bumpless switching, 8
Scan, synchronous, 59
Screens for fault category, 29
Secondary unit, 25
Sequence,
Serial bus address 30, 4 , 6 , 9 , 25 Serial bus address 31, 4 , 6 , 9 , 25 Serial COM port, standard, 18 Serial port connector, 18 Service request 27, 60
Service request 28, 60
SharedI/O, 9 configuration, 36 data parameters, 37 reference values, 37
Simplex cpu, 57
Special references, 63
Start of sweep time, 57
Status LEDs, 3 , 7 , 17
Status references for redundancy systems, 63
STOP mode, 16
Stop to run mode transition, 68 Stop/I/O scan in a redundant system, 64 STOP/IOSCAN mode, 16
Strategy, control, 5
SVCREQ #26, 62
SVCREQ #26 example, 62
SVCREQ #27, 60
SVCREQ #28, 60
SVCREQ 27/28 example, 61
Sweep mode constant, 35 constant window, 35 normal, 34
Sweeps, active and backup, 59
Switch to backup unit time, 8
Switching control to backup unit from user program via SVCREQ, 61 manual switch via pushbutton, 61 on a failure, 61
switching, bumpless, 8
Synchronization, 59 restrictions for applications, 88
Synchronized cpus, 8
Synchronous scan, 59
System components for redundancy, 13
System operation, normal, 55
System setup, basic, 28
T
Terminated parallel cable, 80
Terminated I/O cable, 4 , 5 , 6 , 24 , 81
Terminating communications, 76
Terminating I/O bus, 24
Terminator plug, 24
Terms, definitions of, 11
Text, help, 74
Time to switch to backup unit, 8
Timed contacts, 70
Timer and PID function blocks, 70
Transition, stop to run mode, 68
W
Wait time, fail, 8
Window time, background, 68
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