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Analog modules

5.18 Interrupts of analog modules

S7-400 Automation System Module Data

Reference Manual, Edition 09/2009, A5E00850736-06

247

When OB 40 is exited, the hardware interrupt is acknowledged on the module.

Note

Note: the system does not generate a hardware interrupt if your limit setting exceeds the

overshoot or undershoot range.

Structure of the start information tag OB40_POINT_ADDR of OB 40

The limit values exceeded by the different channels are entered in the start information of

OB 40 in the tag OB40_POINT_ADDR. The figure below shows the assignment of bits in

DWORD 8 of local data.

1 2 3 4

Bit-Nr.

1731 30 29 28 27 26

LD 81

LB 8 LB 9

25 24

LB 11

(1) Value exceeds high limit in channel 1

(2) Value exceeds high limit in channel 0

(3) Value exceeds low limit in channel 1

(4) Value exceeds low limit in channel 0

(5) Bit No.

Figure 5-22 Start Information of OB 40: Which event has violated limits and triggered a hardware

interrupt

Hardware interrupt triggered by "Reached end of scan cycle"

A hardware interrupt programmed to be triggered at the end of scan cycles allows you to

synchronize a process with the scan cycle of the analog input module.

A scan cycle includes the conversion of the measured values of all active channels of the

analog input module. The module processes the channels in succession. When all measured

values are successfully converted, the module reports the existence of new measurement

data at its channels to the CPU by means of an interrupt.

You can always use this interrupt to load the actual, converted analog values.

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