Siemens CPU 948 User Manual

Field ID/length Parameters
1st/2nd word
Meaning
1)
Table 7-1 continued:
05xx
Interrupt servicing: timed interrupts (cont.)
2000 00yy Basic clock rate for timed interrupt servicing:
Basic clock rate = (yy
*
10 ms)
Permitted values: 01H to FFH
D yy = 0A (100 ms)
3000
3001
D Clock rate distribution according to interval 1 (1, 2, 5, 10)
Clock rate distribution according to interval 2 (2
n
)
(Refer to Section 4.5.2)
Interrupt servicing: process interrupts via S5 bus/system interrupts
4000 000c
4001 0002
System interrupt X "on"
D System interrupt X "off"
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.)
5000 000c
5001 0002
System interrupt E "on"
D System interrupt E "off"
6000 000c
6001 0002
System interrupt F "on"
D System interrupt F "off"
7000 000c
7001 0002
System interrupt G "on"
D System interrupt G "off"
8000 000c
8001 0000
D Process interrupts via IB 0 "off"
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".
EEEE End ID
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.
Parameters for DX 0
CPU 948 Programming Guide
C79000-G8576-C848-04
7 - 9

Siemens CPU 948 Specifications

General

Brand	Siemens
Model	CPU 948
Category	Controller
Language	English