Siemens FM 450-1 - Page 77

Start information
The temporary variable OB4x_POINT_ADDR is described in the start information of the OB4x.
The OB4x_POINT_ADDR variable (bytes 8 - 11) consists of four bytes. The information on the
event that initiated the hardware interrupt is entered into these four bytes. The following table
shows which bits are set for which interrupt. All bits not listed have no meaning and are zero.
Byte Bit Signi󹪝cance: Interrupt in the case of...
Counter 1
0 0 Opening the gate
1 Closing the gate
2 Over󹪞ow
3 Under󹪞ow
4 Reaching comparison value 1 in the up direction
5 Reaching comparison value 1 in the down direction
6 Reaching comparison value 2 in the up direction
7 Reaching comparison value 2 in the down direction
1 0 Zero crossing
5 Setting of the counter
Counter 2
2 0 Opening the gate
1 Closing the gate
2 Over󹪞ow
3 Under󹪞ow
4 Reaching comparison value 1 in the up direction
5 Reaching comparison value 1 in the down direction
6 Reaching comparison value 2 in the up direction
7 Reaching comparison value 2 in the down direction
3 0 Zero crossing
5 Setting of the counter
Lost hardware interrupt
If an event occurs that is to trigger a hardware interrupt and the same previous event has not yet
been acknowledged, no further hardware interrupt is triggered; the hardware interrupt is lost.
This can result in the diagnostic interrupt "hardware interrupt lost" depending on the parameters
assigned.
Default setting
No hardware interrupt is assigned in the default setting.
Modes, settings, parameters and commands
8.12 Initiating a process interrupt
Counter module FM 450-1
Equipment Manual, 03/2022, A5E03648739-AC 77