Siemens SIMATIC S5-100U System Manual page 422

Function Modules
Function
Simulator modules are 8-channel modules that can simulate digital input signals and display output
signals.
The type of module to be simulated (input or output) is selected by means of a switch on the rear of
the module and indicated by two LEDs on the front panel.
The module cannot simulate interrupt inputs.
Installation
The simulator module is inserted into a bus unit like any other input or output module (see
chapter 3). The module does not have a coding key and can therefore replace any digital module.
The coding element on the bus unit does not have to be readjusted.
Wiring
There is no electrical connection between the module and the terminal block. It can therefore be
inserted into slots that have already been wired and connected to the power supply.
Addressing
A simulator module is addressed like an 8-channel digital module (channels 0 to 7).
Scan
(examples)
Figure 15-3. Scanning the Simulator Module as a Digital Input
Typical Application
The CPU is in the RUN mode, the green LED is lit but the programmable controller is mal-
functioning. You have also discovered that the fault must be in a particular I/O module. If the
module has no fault indicator, check to see if:
• The power supply is connected.
• The bus connections and interface modules are plugged in correctly.
Then, try to access the module via the process image (STATUS or STATUS VAR). If this
procedure is not successful, replace the module with the simulator module. Perform a second
check with the STATUS or STATUS VAR function. If the simulator performs, the input/output
module you replaced is defective.
15-8
A I 0 . 0
O Q 1 . 1
Channel number
Slot address
Channel "0"
Channel "1"
EWA 4NEB 812 6120-02b
S5-100U