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 C000H)
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
03BCH to 3BEH
*) 0378H to 37FHAutomatically configured by the BIOS and
can be set in the BIOS setup
)
0278H to 27FH
can be set in the BIOS setup
.
*) The BIOS searches the addresses in the order 03BCH, 0378H and 0278H 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 0378H, this
will be LPT1.
Note
The LPT port in the M7-400 expansion module MSM 478 is always at the I/O
address 03BCH. For this reason, the I/O address 03BCH must not be set for the IP
962-LPT interface submodule if an MSM 478 is in use.