ABB DSPB 120 57340001-T Thermal resistance card

Masked Write Response The Masked Write Response provides an acknowledgment to the Masked Write Request message. A positive response indicates that all of the data has been written to the responding device. An error response indicates that one or more of the transfers to the responding device failed. Responders shall use all available means to assure that a write is performed in its entirety or not performed at all. Requesting applications are advised that if partial failures of the write can cause problems with the control algorithm, they should include only one cell in each write to assure complete knowledge of the disposition of the write request. Requesters should be aware that some responding devices are not capable of setting more than one bit in a request. Before sending a mask with more than one bit set, the requester should assure that the responding device supports multiple bit writes.

EGD Data Producer 

The EGD driver will generate produced data as defined in the user configuration exchange list. This data is derived from the module’s internal database and is produced at the set frequency defined in the exchange list. The data can be broadcast to all nodes or to a specific node on the network. Up to 700 database registers can be transferred in a single produced message. Therefore, to transfer the whole database would only require 6 messages (4000 word registers in the module’s database). 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.

EGD Data Consumer 

The EGD driver will consume data as defined in the user configuration exchange list. This data is derived from other nodes on the network and is placed in the module’s internal database. If a consumer exchange is not received at the specified timeout, the driver will update the status of the exchange. When the driver again receives the exchange, the status will be updated. Exchanges received by the consumer driver that are not defined in the exchange list will be discarded. Up to 700 words of data can be consumed in a single message. Therefore, to fill the whole database with values would only require 6 exchanges (4000 word registers in the module’s database). The producer functionality provided in the EGD driver is used to transfer portions of the module’s database to other EGD nodes on the network. The following diagram describes the flow of data between the producer, the internal database and the remote EGD devices

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