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Field ID/length
Parameters
1st/2nd word
Table 7-1 continued:
05xx
2000
3000
3001
4000
4001
5000
5001
6000
6001
7000
7001
8000
8001
EEEE
1)
D = default with DX 0 not loaded or not present.
2)
xx = field length (number of data words occupied by the parameters).
3) With the CPU 948, can also be combined with a system interrupt.
4)
Must not be combined with process interrupts via IB 0.
5)
When specifying the field length, the value "2" must be taken into account for parameters occupying two data words.
6)
For updating the timers, please read the explanation on the following page.
7)
Set cycle monitoring time with OB 31 or DX 0: If the cycle monitoring time is set both with OB 31 and with DX 0, the system
program uses the setting made in OB 31 since it has already evaluated DX 0. For this reason, you should only use one of these
possibilities. We recommend setting the cycle monitoring time using DX 0.
CPU 948 Programming Guide
C79000-G8576-C848-04
1)
Meaning
Interrupt servicing: timed interrupts (cont.)
00yy
Basic clock rate for timed interrupt servicing:
Basic clock rate = (yy
Permitted values:
D yy = 0A (100 ms)
D Clock rate distribution according to interval 1 (1, 2, 5, 10)
Clock rate distribution according to interval 2 (2
(Refer to Section 4.5.2)
Interrupt servicing: process interrupts via S5 bus/system interrupts
000c
System interrupt X "on"
0002
D System interrupt X "off"
000c
System interrupt E "on"
0002
D System interrupt E "off"
000c
System interrupt F "on"
0002
D System interrupt F "off"
000c
System interrupt G "on"
0002
D System interrupt G "off"
000c
D Process interrupts via IB 0 "off"
0000
Process interrupts via IB 0 "on"
c = level priority, permitted values 1 to 2
D c = 2 (level priority 2)
When "process interrupts via IB 0 = on":
-
only single processor mode,
-
only "interruptability at block boundaries".
End ID
Parameters for DX 0
10 ms)
*
01H to FFH
c = level priority,
Permitted values: 1 to 5
X = A, B, C or D
V c = 2 (level priority 2)
(The servicing of system
interrupts can also be
combined with
"interruptability at block
boundaries" with the
CPU 948.)
n
)
7 - 9
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