Addressing And Access To I/Os; Addressing The Onboard I/Os - Siemens SIMATIC S5-90U System Manual

S5-90U/S5-95U
6

Addressing and Access to I/Os

The S5-90U and the S5-95U have two types of inputs and outputs. The inputs and outputs located
on the programmable controller itself are called onboard I/Os. The S5-100U modules that expand
your programmable controller are called external I/Os.
The inputs and the outputs of both the external I/Os and the onboard I/Os have different assigned
addresses so that you can access them specifically.
changed. The external I/O addresses are the same as the slot addresses assigned to the S5-100U
modules.
6.1

Addressing the Onboard I/Os

The following Table shows all the addresses of the onboard I/Os available to the S5-90U and S5-
95U. The addresses of the onboard I/Os are fixed.
Table 6-1. Onboard Addresses of the S5-90U and S5-95U
Function
Digital onboard I/Os
Analog onboard I/Os
Interrupts
Counters
EWA 4NEB 812 6115-02b
The onboard I/O addresses cannot be
Addresses in the S5-90U
Inputs: I 32.0 to 33.1
Outputs: Q 32.0 to 32.5
Interrupt input: I 33.0
Counter input: I 33.1
Counter value: IW 36
Addressing and Access to I/Os
Addresses in the S5-95U
Inputs: I 32.0 to 33.7
Outputs: Q 32.0 to 33.7
Inputs: IW 40 to IW 54
Outputs: QW 40
Interrupt inputs: I 34.0 to I 34.3
Value of counter A : IW 36
Value of counter B: IW 38
6-1