Index
Operation, differences for cpu 780, 65
Operation of a cpu redundancy system, 55
OVR_PRE %S reference, 70
P
Parallel bus termination, 80
PID and Timer function blocks, 70
PLC fault table, redundancy error codes, 74
Port, standard serial COM, 18
Power±up sequence, 55
Preferred unit, 25
Primary redundant plc, configuration, 44
Primary unit, 25
Programming considerations, 10
Prrogramming,
R
Rack, communications, 22
Racks
for redundancy systems, 26 standard Series 90, 26 VME, 26
RCMs, faulting, 75
Redund type, configuration of, 34
Redundancy alternatives
esd duplex application logic, 85
esd duplex gmr application logic, 85 esd triplex gmr product, 85
hot standby application logic, 85 hot standby product, 85
hot standby product plus application logic, 85
with multiple folders, handling, 30
Redundancy communications module connectors, 21
description of, 19 illustration of, 19 LEDs, system status, 20
board ok, 20
local system active, 21
local system ready, 20 remote system active, 21 remote system ready, 21
pushbutton for unit selection, 21 system status LEDs, 7
Redundancy CPU considerations, 64
Redundancy cpu considerations I/Ointerrupts, 64
timed interrupts, 64 vme integrator racks, 64
Redundancy CPU module, 7 architecture, 14
battery connectors, 17 capacities, 14
catalog number, IC697CPU780, 13 description of, 13
expansion memory board, 18 features of, 15 illustration of, 15 installation information, 13 location in racks, 14 memory protect keyswitch, 17 mode switch, 16
serial port connector, 18 status LEDs, 17 watchdog timer, 14
Redundancy cpu requirements, 33
Redundancy option key, 86
Redundancy options, table of, 87
Redundancy system requirements, 28
Redundancy system setup, basic, 28
Redundant cpu module, resynchroniza- tion, 57
Reference values, shared I/O, 37
Reference, OVR_PRE, 70
References, %S, 7
References, %S, definition of, 63
Repair,
Requirements for configuration, 10
Resynchronization, 9
Resynchronization, redundant cpu, 57
Role switch SVCREQ, 62
Run disabled mode, 65
Run disabled mode, guidelines, 66
Run/outputs disabled mode, 16
Run/outputs enabled mode, 16
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