Table of Contents
Advertisement
Byte 3: Master address
The address of the DP master that assigned parameters to this DP slave is entered in the
"Master_Add" byte.
If the DP slave did not have parameters assigned to it by any DP master, the DP slave sets
the address 255 in this byte.
Bytes 4 and 5: Vendor ID of the slave ("Ident_Number")
The vendor ID ("Ident_Number") for the DP slave type is entered in bytes 4 and 5. This
identifier can be used to identify the slave.
The more significant part of the value is in byte 5.
5.4
Device-specific diagnostics in DP-V1
There are two variants of device-specific diagnostics with DP-V1 slaves:
● Interrupt type
● Status type
The two variants differ from each other in the coding of byte 1, bit 7 of the device-specific
diagnostics data. The difference is component-specific.
Byte 0: Header
The two most significant bits have the value 00. This identifies the "module-specific
diagnostics data" field (see bytes 4... 62) as a whole.
The remaining six bits indicate the length of the data field including byte 0.
Byte 1: Variant "Interrupt type"
Table 5- 5
Bit no.
7
6...0
CM 1542-5
Operating Instructions, 11/2018, C79000-G8976-C290-04
Structure of byte 1 of the device-specific diagnostics (variant "interrupt type")
Value
Meaning
0
Interrupt
Alarm_Type
0
- reserved -
1
Diagnostics interrupt
2
Hardware interrupt
3
Pull interrupt
4
Plug interrupt
5
Status interrupt
6
Update interrupt
7...31
- reserved -
Diagnostics and upkeep
5.4 Device-specific diagnostics in DP-V1
Meaning
39
Hide quick links:
Advertisement
Table of Contents
