Siemens M7-400, S7-400 13.4.2 Addressing and Interrupts

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 C000H).
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
03F8H to 03FFH
*)
02F8H to 02FFH
*) 03E8H to 03EFHAutomatically configured by the BIOS and
02E8H to 02EFH
Automatically configured by the BIOS and
can be set in the BIOS setup.
– 0380H to 0387H
– 0280H to 0287H
*) The BIOS searches the addresses in the order 03F8H, 02F8H, 03E8H and 02E8H 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 12E8H, this will be COM1.
Example of Setting an AT-Compatible I/O Address
In the following example, the I/O addresses 03F8H (COM1) for COMa and 02F8H
(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
“00H” at “Config.Index”.
4. Enter “36H” at “Value”. This value is then written into the configuration register
(see also Table 13-13).
5. Press the OK button.