
IP 240 Addressing
3 Addressing
The IP 240 module reserves an address space of 16 bytes in the I/O areas. All data are exchanged
via these areas, which can be read out and written to by the S5 CPU. The data transfer is handled
by
a standard function block. It is merely necessary to set the desired starting address and the
I/O
area (P or Q area) via coding switches on switchbanks S2 and S3 on the module.
For address decoding, the IP 240 needs the memory-I/O select signal PESP in addition to the S5 bus
addresses A 0 to A 11.
Fig. 3-1. Locations of the Address Switches
S2
S3
off on
off on
S2: Setting the address space
S3: Setting the starting address
X6
X1
X2
X3
X4
X5
Note
The modules are delivered with a set starting address of 128 in the normal (P)
I/O area. Before start-up, make sure that no two modules reserve the same
EWA 4NEB 811 6120-02a
3-1
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