Caractéristiques Avantages

The 3964R protocol was designed by Siemens for bi-directional data communication through a point-to-point connection. It is a peer to peer protocol with read and write access. A BCC checksum ensures the safety of the transfer.

Applications

The module is ideal in control configurations where there is a need for the ControlLogix processor to exchange data with other non-Rockwell Automation control devices in low speed applications.

The MVI56-S3964R can communicate with devices using two RS-232, RS-422 communication lines (ports). The ports operate independently from each other.

Spécifications

• Single Slot - 1756 backplane compatible

• The module is recognized as an Input/Output module and has access to processor memory for data transfer between processor and module

• Ladder Logic is used for data transfer between module and processor. Sample ladder file included.

• Configuration data obtained from configuration text file downloaded to module. Sample configuration file included

• Local or remote rack

• Single-slot, ControlLogix backplane compatible
• Multiple modules can be placed in a rack up to the chassis power supply limit
• While in 3964R with RK512 mode on PRT1 and PRT2, DB-SEND and DB-FETCH instructions can be initiated from the ControlLogix processor or received by the communications partner
• While in 3964R without RK512 mode on PRT1 and PRT2, data can be sent from the ControlLogix processor or be received from the communications partner
• The maximum transfer size is 512 bytes in any mode
• Data byte swapping can be configured to adjust to a different word format
• While in 3964R with RK512 mode on PRT1 and PRT2, evaluation of the header information DB (data block), DW (data word) and coordination bytes 9 and 10 is possible
• Communication activity and diagnostics are available through LEDs and acknowledgment telegrams

Ladder Logic

Ladder logic programming in the ControlLogix processor is required in order to enable and support the Siemens 3964R protocol functionality. The ladder program handles the encoding/decoding of data transferred from the module as well as the initiation of protocol-specific functionality in the module. Example ladder programs are provided with the module to simplify the implementation of the module in the user application.

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