Functional Specifications

• Single-slot, CompactLogix I/O 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 CompactLogix processor or

received by the communications partner

• While in 3964R without RK512 mode on PRT1 and

PRT2. data can be sent from the CompactLogix

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 CompactLogix

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 ease

the implementation of the module in the user application.