Specifications

B-3
IP 240
EWA 4NEB 811 6120-02b
S5 modules in the S7-400 may be addressed in the following addressing
areas:
 I/O area (P area)
 Extended I/O area (Q, IM3, IM4)
 Page area
A PESP signal (that is, a memory I/O select signal) is generated in the P area
only when S5 modules are interfaced to the system via the adapter casing.
The signal is forwarded to the S5 module. No PESP signal is generated for
the Q, IM3 or IM4 areas.
When the S5 modules are interfaced via the IM 463-2, the PESP signal is
generated by the IM 314 in the S5 expansion unit (for the selected P, Q, IM3
or IM4 area).
This corresponds to the 256-byte I/O area as defined for SIMATIC S5. The
S5 address of the module in these areas is set on the module using jumpers or
switches. Please refer to the relevant manual for the correct setting.
For modules which reserve input and output areas, an entry must be made
under STEP 7 for each area.
In order to operate an S5 module with page addressing, you need the revised
standard function blocks (S7 functions). These standard function blocks call
special system functions which emulate the S5 page commands. These stan-
dard function blocks can be linked into your application program.
Even in the case of page addressing, you must assign a logical address. This
logical address is entered in the interrupt OB’s local data area as start in-
formation.
Under STEP 7, you must assign an S7 address and an S5 address in the input
area with length 0. You may not assign an address for this module in the out-
put area.
Note
When using S5 modules in your S7-400, you must observe the following
carefully when setting the module addresses:
– No two S7 addresses may be the same.
– No two S5 addresses may be the same in any given area (P, Q, IM3,
IM4).
– Even when an S5 module has an address area with a length of 0, its
address may not lie within the address area of another S5 module.
S5 Address Areas
I/O Area
Page Area
Addressing S5 Modules