Siemens MICROMASTER 440 Quick Start Manual page 63

Issue 08/03
6.1.1 Checking Wiring to Digital Inputs
When you look at r0722 you will get a display that looks something like the one shown in figures
below. r0722 is a bit parameter. Each bit reflects a different digital input or analog input. You should
see the bits toggling on and off as you change the state of the inputs. If you do not see any change
then you should check your wiring.
Figure 6-1 r0722 Binary Input Values
For example if DIN1 and DIN4 are high then your display will look like this:
Figure 6-2 r0722 Binary Input Values Example
6.1.2 Checking Wiring to Analog Inputs
You can also use r0722 for some basic testing of the analog inputs. Bits 6 and 7 in r0722 show AIN1
and AIN2 respectively. If the AIN signal is low (<2V) the bit will be OFF, with your AIN input set high
(>4V) the bit will be ON. This parameter should be used just to check that your connection is OK
Figure 6-3 r0722 Display When Both AINs High.
There are some other parameters that can also be used to troubleshoot your analog signals.
MICROMASTER 440 Quick Start Guide 63
6SE6400-5GA00-0BP0