Siemens SIMATIC 3964(R) communication protocol
Supported device types and versions
Communication line configuration
Communication station configuration
I/O tag configuration
Literature
Changes and modifications
Document revisions
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Protocol implementation allows reading data in just one data block of the 3964 protocol (the protocol is a specification of the link layer, the transport layer is the matter of the PLC application software). Connection The connection is periodically initialized by Simatic, thethe D2000 KOM process confirms and takes over the data block according to the specification of the 3964 protocol. Data block initialization in PLC Simatic must be programmed in the STEPS5/7 programming language according to a particular CP communication module documentation.
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For complex reading or writing of data into PLC Simatic, we recommend to use using the Siemens SIMATIC RK512 protocol.
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The Communication station dialog box - tab Protocol parameters.
Parameters defined in the input field have an effect on some optional protocol parameters. The following station protocol parameters can be defined:
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| Parameter | Meaning | Unit | Default value | ||||||
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| Delay The delay between the response readings readings till its finalization. | ms | 50 ms | ||||||
| Repetition count of response readings The maximum number of retries of the response reading till its finalization. | - | 600 | ||||||
| Enable the 3964 protocol, i.e. version with no transmission security using the checksum. By default, the 3964R protocol with the BCC checksum is used. | YES/NO | NO |
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| Format | Meaning |
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| DWm | WORD type value (16 bits) included in received data block on the m word-offset (offset is counted from 0). Value is converted as a signed number in case of the I/O tag type of the Ai type or as an unsigned number in the case of the Ci type. |
| DLm | Left bit The left byte value of WORD placed on the m word-offset. Possible I/O tag values are Ai or Ci. |
| DRm | Right bit The right byte value of WORD placed on the m word-offset. Possible I/O tag values are Ai or Ci. |
| Dm.n | Binary address, the value of the n bit (n is within the range 0...15) of WORD placed on the m word-offset. Possible I/O tag type is Di (or Ai and Ci, if get the values of 0/1). |
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- Ver. 1.0 - January 24th, 2002 - document creation.
- Ver. 1.1 - November 3rd, 2010 - document update.
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