Siemens Simatic S7-400 - Manual (Page 508)

Interface Submodules
13-12
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
13.4.2 Addressing and Interrupts
Addressing
The IF 962-COM 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 COM 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 13-9 Addressing the COM Ports in the AT-Compatible Address Area
Name I/O Address Remarks
03F8
H
to 03FF
H
*)
02F8
H
to 02FF
H
*)
03E8
H
to 03EF
H Automatically configured by the BIOS and
02E8
H
to 02EF
H
Automatically configured by the BIOS and
can be set in the BIOS setup.
– 0380
H
to 0387
H
– 0280
H
to 0287
H
*) The BIOS searches the addresses in the order 03F8
H
, 02F8
H
, 03E8
H
and 02E8
H
and
assigns COM1, COM2, COM3 and COM4 in ascending order. There is no fixed
assignment of the I/O addresses to COMx. For example, if only one COM port is detected
at address 12E8
H
, this will be COM1.
Example of Setting an AT-Compatible I/O Address
In the following example, the I/O addresses 03F8
H
(COM1) for COMa and 02F8
H
(COM2) for COMb are to be set in the BIOS setup. Proceed as follows to do this:
1. Select the “IF Modules” page in the BIOS setup.
2. Enter the submodule receptacle number of the interface submodule in “Select
Module #”.
3. Enter the offset address for the configuration register of the interface submodule
“00
H
” at “Config.Index”
.
4. Enter “36
H
” at “Value”. This value is then written into the configuration register
(see also Table 13-13).
5. Press the OK button.