Mechanism Of The Loop Control Unit - Omron CS1W-LC001 Operation Manual

Configuration of Function Blocks
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

Mechanism of the Loop Control Unit

Section 3-1
SECTION 3
69