GE RX3i User Manual page 6

EGD Consumers ........................................................................................................................................................... 70
5.2 EGD Exchanges ........................................................................................................................................... 71
Content of an Ethernet Global Data Exchange........................................................................................... 71
Data Ranges (Variables) in an Ethernet Global Data Exchange ........................................................ 71
Valid Memory Types for Ethernet Global Data ............................................................................................ 72
Planning Exchanges .................................................................................................................................................. 72
Using Ethernet Global Data in a Redundancy System ............................................................................ 73
5.3 Sending an Ethernet Global Data Exchange to Multiple Consumers ............................................... 73
Multicasting Ethernet Global Data .................................................................................................................... 73
Broadcasting Ethernet Global Data .................................................................................................................. 74
Changing Group ID in Run Mode ........................................................................................................................ 74
5.4 Ethernet Global Data Timing ................................................................................................................... 75
EGD Synchronization ................................................................................................................................................ 75
Configurable Producer Period for an EGD Exchange .............................................................................. 76
Consumer Update Timeout Period .................................................................................................................... 76
5.5 Time-Stamping of Ethernet Global Data Exchanges ........................................................................... 77
Obtaining Timestamps from the Ethernet Interface Clock ................................................................... 78
Obtaining Timestamps from the CPU TOD Clock ....................................................................................... 79
SNTP Operation ............................................................................................................................................................ 86
5.6 Effect of PLC Modes and Actions on EGD Operations ......................................................................... 88
Run Mode Store of EGD ........................................................................................................................................... 89
5.7 Monitoring Ethernet Global Data Exchange Status ............................................................................ 92
Exchange Status Word Error Codes.................................................................................................................. 93
Chapter 6 Programming EGD Commands ................................................................................................ 94
6.1 General Use of EGD Commands .............................................................................................................. 94
6.2 Using EGD Commands in a Redundancy System ................................................................................. 94
6.3 COMMREQ Format for Programming EGD Commands ...................................................................... 94
6.4 COMMREQ Status for the EGD Commands ........................................................................................... 95
COMMREQ Status Values ........................................................................................................................................ 95
6.5 Read PLC Memory (4000) .......................................................................................................................... 96
Read PLC Memory Command Block ................................................................................................................. 96
6.6 Write PLC Memory (4001) ......................................................................................................................... 99
Write PLC Memory Command Block................................................................................................................. 99
6.7 Read EGD Exchange (4002) ..................................................................................................................... 101
Read EGD Exchange Command Block ..........................................................................................................101
GFK-2224Q January 2017
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