schmersal Praxi 100, Manual

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42
Reply Frame:
Reply Frame:
Message Frame:
Table 43.
Table 47.
Table 45.
Exception response:
Table 44.
Table 46.
01 04 04 13 88 09 C4 78 E9
01 84 04 42 C3
01 04 17 70 00 05 34 66
6.5.3 Example 3 - Exception Response
In an exception response, the Slave sets the most-significant bit (MSB) of the function code to 1.
The Slave returns an exception code in the data field.
Command Master - Slave:
Answer Slave - Master:
Address 01 hex Slave address 1 hex (= 1)
Function 04 hex Function 4 hex (= 4)
Data
Starting address HI 17 hex
Starting address 1770 hex (= 6000)
Starting address LO 70 hex
No. of registers HI 00 hex
Invalid number of registers 0005 hex (= 5)
No. of registers LO 05 hex
Error Check
CRC HI 34 hex
CRC field 3466 hex (= 13414)
CRC LO 66 hex
Address 01 hex Slave address 1 hex (= 1)
Function 84 hex Most significant bit set to 1
Data Error Code 04 hex Error code 04 => Slave Device Failure
Error Check
CRC HI 42 hex
CRC field 42C3 hex (= 17091)
CRC LO C3 hex