
Modbus Commands
2-22
SIMATIC TI505/TI500 MODNIM User Manual
Modbus Function Descriptions (continued)
Diagnostic
Code — 02
0002 | 00 00
Diagnostic
code
Information frame
When
Function Code 08 uses diagnostic code 0002, the information field
may contain any value (00 00 shown). The MODNIM returns a 16-bit word
containing diagnostic data about the attached device. The meaning of each
bit is given in T
able 2-5.
T
able 2-5
Diagnostic Bits
Bit Description
0 O. S. RAM parity error
1 Program RAM parity error
2 O. S. fatal error
3 Watchdog timeout error
4 Dynamic program memory diagnostic
5 Illegal Op code
6 RAM diagnostics failure
7 ROM diagnostics failure
8 Scan diagnostic failure
9 I/O fatal error
10 Scan overrun error
11 Abnormal power loss
12 Unidentified board failure
13 EEPROM card RAM download error
14 Not used
15 Not used
If
the bit contains a 1, then the error associated with that bit is current.
This code has no effect on the functioning of the MODNIM.
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