Diagnostics Using the User Program
10-16
DP/PA Link and Y Link Bus Couplings
A5E00193841-011
Diagnostic interrupt
When a DPV0 slave or a DPV1 slave not capable of interrupts reports a diagnosis
on the underlying master system, the IM 157 initiates a diagnosis interrupt on the
higher level DP master system (”proxy diagnosis interrupt”).
The diagnostic frame of the slave is stored in the additional interrupt information. If
this frame is longer than 59 bytes, the information beginning with the 60th byte is
discarded. In addition, bit 7 (Ext_Diag_Overflow) is set in the third passed byte
(byte x+6).
The diagnosis of an interrupt-capable DPV1 slave that is operated in the DPV1
mode does not lead to a diagnostic interrupt.
Insertion/removal interrupt
If a slave fails or is restored on the underlying master system, the IM 157 initiates
an insertion or removal interrupt on the higher level DP master system.
Byte x+4 Bus address of the slave concerned
Byte x+5 Number of identifiers of the slave concerned on
the underlying master system
Byte x+6 Offset of the input data of the slave concerned in
the input data of the IM 157
Byte x+7 Length of the input data of the slave concerned in
bytes
Figure 10-10 Structure of the additional interrupt information for the insertion/removal
interrupt
Start address x is 168 in redundant operation and 160 in DP standard master
operation.
For modular slaves, the additional interrupt information refers to the entire slave
and not to the individual modules.
Insertion/removal interrupts are not reported until after the start-up delay has
elapsed. Removal interrupts that occur before that point are processed later,
whereas insertion interrupts are discarded.
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