ABB DSPC 155 57310001-CX Output expansion module

The internal database is central to the functionality of the module. This database is shared between all the drivers in the module and is used as a conduit to pass information from one device on one network to one or more devices on another network. This permits data from devices on one communication port to be viewed and controlled by devices on another port. The consumer functionality provided in the EGD driver is used to transfer data from other nodes on the network into the module’s database. The following diagram describes the flow of data between the consumer, the internal database and the remote EGD devices:Upon completing the power up configuration process, the module enters an infinite loop that performs the functions shown in the following diagram.

General Concepts 

The following topics describe several concepts that are important for understanding the operation of the MVI56-EGD module. On power up the module begins performing the following logical functions: 1 Initialize hardware components o Initialize ControlLogix backplane driver o Test and Clear all RAM o Initialize the serial communication ports 2 Reads configuration from Compact Flash Disk 3 Initialize Module Register space 4 Enable Slave Driver on selected ports After the module has received the Module Configuration, the module will begin communicating with other nodes on the network, depending on the configuration.

ControlLogix Processor

 Not in Run Whenever the module detects that the processor has gone out of the Run mode (that is, Fault or PGM), backplane communications will halt between processor and module but not on the EGD network. When the processor is returned to a running state, the module will resume communication with the Processor.The MVI56-EGD module communicates directly over the ControlLogix backplane. Data is paged between the module and the ControlLogix processor across the backplane using the module's input and output images. The update frequency of the images is determined by the scheduled scan rate defined by the user for the module and the communication load on the module. Typical updates are in the range of 1 to 10 milliseconds.

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