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Configuration of Function Blocks
Section
3-1
69
SECTION 3
Mechanism of the Loop Control Unit
3-1
CONFIGURATION OF FUNCTION BLOCKS .......................................... 70
3-1-1
Configuration of Function Blocks ............................................................................................................... 70
3-1-2
Preparing Function Block Data Sheets ........................................................................................................ 70
3-1-3
ITEMs Common to All Function Blocks..................................................................................................... 73
3-1-4
ITEMs Unique to Individual Function Blocks............................................................................................. 74
3-1-5
Connecting Function Blocks........................................................................................................................ 80
3-2
DESCRIPTION OF OPERATION ................................................................ 84
3-2-1
When Turning the Power ON to the PC ...................................................................................................... 84
3-2-2
Details of Hot Start, Cold Start and Stop State ............................................................................................ 87
3-2-3
Indicating run/stop of the Loop Control Unit (common to all function blocks) .......................................... 89
3-2-4
Stop each function block operation and cancel operation-stop.................................................................... 89
3-2-5
Monitoring the Run Status of Function Blocks ........................................................................................... 91
3-2-6
Relationship between CPU Unit states and Loop Control Unit States ........................................................ 92
3-2-7
Specifying the Operation Cycle................................................................................................................... 93
3-2-8
Conditions for Determining the Operation Cycle ........................................................................................ 96
3-2-9
Order of Operations ..................................................................................................................................... 98
3-2-10
About Load Rate........................................................................................................................................ 100
3-2-11
External I/O Refresh Cycle on the Overall System ................................................................................... 106
3-3
EXCHANGING DATA WITH THE CPU UNIT ....................................... 114
3-3-1
Mutual Exchange of Run Status ................................................................................................................ 114
3-3-2
Exchanging Any Data................................................................................................................................ 117
3-4
EXCHANGING DATA WITH CX-PROCESS MONITOR/SCADA
SOTWARE AND WITH OTHER NODES ................................................. 122
3-4-1
Data Memory (D) for Node Terminals ...................................................................................................... 122
3-4-2
Exchanging Data with CX-Process Monitor.............................................................................................. 126
3-4-3
Exchanging Data with SCADA Software.................................................................................................. 130
3-4-4
Exchanging Data with a Loop Control Unit at Other Node....................................................................... 132
3-5
FAIL-SAFE COUNTERMEASURE GUIDELINES ................................. 135
3-5-1
Measures When the Loop Control Unit Has Stopped Running ................................................................. 135
3-5-2
Measures for a CPU Unit fatal error.......................................................................................................... 137
3-5-3
Required Conditions for the Man-Machine Interface ................................................................................ 137