Siemens SIMATIC S5 ET 200U - Addressing; Function; Installation; Wiring

9-6
ET 200U Distributed I/O Station
EWA 4NEB 812 6087–02b
The module contains two pulse timers. As long as the timer is running, the
following conditions exist:
 The LED of the respective channel is lit
and
 A 1 is reported to the CPU.
You preselect the pulse duration using the time range selector0.3 s/3 s/
30 s in a definite range and then set the exact value by means of a poten-
tiometer on the front panel. This selector has scale divisions to simplify set-
ting.
(time value = time range scale value)
Time range: 3 s
Scale value: 7 s
Set time value: 7 3 s = 21 s
You install the timer on a bus unit like any other input or output module.
No wiring is required.
A timer module is addressed like a two–channel digital module (channel 0 or
1, see Figure 9-2).
The timer module is addressed like a digital output module for starting, reset-
ting, or interrupting the pulse. The signal state is scanned like a digital input
module.
S Q x.2 Channel “0” ; Starting the Pulse
S Q x.3 Channel “1”
R Q x.2 ; Interrupt/
R Q x.3 ; Reset
A I x.0 ; Scan
A I x.1 ; “1” = Timer Running
Channel Number
Slot Address
Figure 9-2 Scanning the Timer Module
Function
Example
Installation
Wiring
Addressing
Function Modules