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IP 240 Positioning
10.10 Initializing the Parameters for Interrupt Generation (PRA1, PRA2, ABIT)
The following status bits have interrupt capability, and can trigger an interrupt on the S5 CPU
when they go to ”1” or ”0”. The associated interrupt bit is also set in the interrupt request bytes.
Table 10-14. Status Bits with Interrupt Capability and the Associated Interrupt Bits
Status
bit
Interrupt
bit
Function
BEE1 BE1 Range BEE1 entered
BEE2 BE2 Range BEE2 entered
BEE3 BE3 Range BEE3 entered
ZBEV ZBV Target range exited
RIUM RIU Reversal point reached
Status
bit
Interrupt
bit
Function
MESE MES Final value stored
UEBS UBS Final value overwritten
UEBL UEB Overrange
DRBR DRB Wirebreak
NPUE NPU Zero mark error
:positive edge triggers interrupt :negative edge triggers interrupt
Note
The interrupts for actual value-dependent status bits BEE1 to 3, ZBEV and RIUM are
generated only once for each position selected.
If, for example, range BEE1 is exited following an interrupt and subsequently
reentered, no new BE1 interrupt is generated.
New interrupts are possible only when a position number is reselected.
Initializing the parameters for interrupt generation
When you configure the channel, you can specify the status bits that are to trigger an interrupt in
parameters PRA1 and PRA2.
: JU FB 167 : JU FB 167
NAME : STRU.POS NAME : STRU.POS
: Assigned : Assigned
: to status bit : to status bit
PRA1 : KM Bit 0 BEE1 PRA2 : KM Bit 0 UEBL
: Bit 1 BEE2 : Bit 1 NPUE
: Bit 2 BEE3 : Bit 2 DRBR
: Bit 3 MESE : Bit 3 UEBS
: Bit 4 ZBEV
: Bit 5 RIUM
The bits that are to generate an interrupt must be ”1”.
How an interrupt is generated depends on the PLC in which the IP 240 is used ( Section 5.1).
Following
an interrupt, the interrupt request bytes must be read out from the IP 240
( Section 10.17).
EWA 4NEB 811 6120-02a
10-35
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