Siemens SIMATIC S5 Manual page 289

Modules that occupy input and output areas require a separate entry for each area
to be made under STEP 7.
Page frame area
To use an S5 module with page frame addressing you need the revised stan-
dard function blocks. These standard function blocks invoke special system
functions that emulate the S5 page frame commands. The standard function
blocks must be linked in the application program.
With page frame addressing, too, you must assign a logic address. This logic ad-
dress is stored as start information in the local data of the alarm OB.
Under STEP 7 you must assign an S7 address and an S5 address of length 0 in
the input area. You must not assign an address for this module in the output area.
Note
If you use S5 modules in your S7-400 system, you must observe the follow-
ing points when you set the module address:
– An S7 address must not be duplicated
– An S5 address must not be duplicated in the same area (P, Q, IM3, IM4)
– Even if the S5 module has an address range of length 0, its address may
Typical addressing
Communications between CPU and an IP are performed via the S5 bus inter-
in the page frame
face and a 2-kB dual-port RAM that is subdivided into two page frames.
area
The page frames always lie in a factory-set address range. All you have to do
is to select the page frame number of the module's first page frame.
The two page frames of a module always occupy two consecutive numbers. The
IP automatically recognizes the address of the second page frame.
Upon delivery, each module has been set to the same address area for page frame
addressing.
When you configure your hardware under STEP 7, you must enter the following
parameters in the input area:
IP244
C79000–B8576–C866–01
not be in the address area of another S5 module.
– S7 address: Logic address
– S5 address: 0 (range 0 ... 255; must not be duplicated in the
selected area)
– Length: 0
– Partial PA: 0
– Area: P (range P, Q, IM3, IM4)
Addressing S5 Modules
7–11