ABB DSIH 72VR 57310290-RB Pulse output module

SNTP is used for time synchronization of produced and consumed commands. When an exchange occurs the driver compares time stamps from the previous exchange. When the new exchange time is less than the previous exchange, the exchange is ignored. This can occur when the Ethernet packets are routed and delayed. Time synchronization provides for data integrity. The following table lists the parameters defined in this section: The SNTP driver will compute a new clock value every 5 minutes using the average value of 10 samples each collected over an approximate 6-second period. This new value will be used to adjust the clock maintained by the SNTP driver and used by the application. If a valid database register is specified, the driver will place the time value into the module’s database. The first two registers will contain the number of seconds and the next two registers will contain the number of microseconds since January 1, 1970.

Functional Overview 

GE Fanuc Automation and GE Drive Systems developed an Ethernet Global Data, or EGD, exchange for PLC and computer data in 1998. GE Ethernet Global Data (EGD) offers versatility where a mix of control devices requires cooperation with each other. This involves sharing of information across the applications regardless of device or network type, often at high speed, and with high reliability. Bandwidth utilization is optimized by using efficient communication methods. High reliability means fewer communication failures and having the ability to detect failures upon occurrence. Particular emphasis is delivered for applications requiring periodic or frequent updates and time synchronization of devices. The protocol supports Unicast, Broadcast and Multicast group messaging. Efficiency is based on the fact each device on the network can produce these types of messages and each device determines which of these messages to consume.

Ethernet Global Data Compatible Devices 

Devices that support the Ethernet Global Data protocol: 

GE Series 90-70 PLC CPU (CMM742 with EGD support) 

GE Series 90-30 PLC CPU 364 (with EGD support) 

VersaMax CPU E05 

Several drives and turbines
Ethernet Global Data Service for NT 

CIMPLICITY HMI software
Several HMI products

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