Siemens Simatic S7-400 - Manual (Page 514)

Interface Submodules
13-18
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
13.5.2 Addressing and Interrupts
Addressing
The IF 962-LPT interface submodule can be addressed in the following two ways:
• In the AT-compatible I/O address area
• In the M7-300/400-reserved I/O address area (from C000
H
)
Addressing in the AT-Compatible I/O Address Area
The LPT ports can be operated in the AT-compatible I/O address area. The
settings are made in the BIOS Setup. You can see the addresses that can be set in
the BIOS Setup from the following table.
Table 13-16 Addressing the LPT Ports
Name I/O Address Remarks
03BC
H
to 3BE
H
*) 0378
H
to 37F
H
Automatically configured by the BIOS and
can be set in the BIOS setup
)
0278
H
to 27F
H
can be set in the BIOS setup.
*) The BIOS searches the addresses in the order 03BC
H
, 0378
H
and 0278
H
and assigns
LPT1, LPT2 and LPT3 in ascending order. There is no fixed assignment of the I/O
addresses to LPTx. For example, if only one LPT port is detected at address 0378
H
, this
will be LPT1.
Note
The LPT port in the M7-400 expansion module MSM 478 is always at the I/O
address 03BC
H
. For this reason, the I/O address 03BC
H
must not be set for the IP
962-LPT interface submodule if an MSM 478 is in use.