Siemens SIMATIC PG 760 PII Manual page 46

PG 760 PII Expansions
Switch Settings
The following switch settings are only listed for information purposes. They
are set in the factory and must not be changed.
x means that this switch is irrelevant to the described function.
BIOS Source
off
on
TTY Settings
S2
on
off
x
Clock Settings S2(4) S3(4) S3(3) S3(2) S3(1)
S2, S3
off
off
off
off
Standard
Settings
Figure 4-5
4-8
S2 (3)
Boot EPROM activated (standard setting)
Boot EPROM deactivated (boot module required)
S2 (1) S2 (2)
on Active TTY interface
(standard setting)
x TTY transmitter loop, isolated from current source
(passive setting)
off TTY receiver loop, isolated from current source
(passive setting)
off off off off
off on off off
off off on off
off on on off
1 2
3
4
2
3
Standard Settings of Switches S2 (1 to 4) and S3 (1 to 4) for 333 MHz
Pentium PII CPU
Function
Function
ISA Bus PCI Bus CPU
Clock Clock Bus
Clock
8.25MHz 33MHz 66MHz
8.25MHz 33MHz 66MHz
8.25MHz 33MHz 66MHz
8.25MHz 33MHz 66MHz
4
1
PG 760 PII Programming Device
C79000-G7076-C766-01
CPU Core
Clock
(CPU
internal)
133MHz
200MHz
266MHz
333MHz
ON
S2
OFF
OFF
S3
ON