Checksum; Invalid Characters And Messages - Siemens SIMATIC TI505 User Manual
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Also See for SIMATIC TI505:
- User manual (127 pages) ,
- Installation and operation manual (66 pages) ,
- User manual (28 pages)
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Checksum
Invalid Characters
and Messages
SIMATIC TI505/TI500 MODNIM User Manual
The checksum needs 16 bits and uses the Cyclic Redundancy Checksum
(CRC) method. The calculation of this checksum is described in the Modbus
Protocol Reference Manual.
The MODNIM ignores messages that contain invalid characters. Messages
containing the following errors are also ignored.
Incorrect checksum
Parity error
Framing errors
Frame too long
Incomplete transmission
Modbus Commands
2-5
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