Siemens SIMATIC 505 - Input Flag Bits; Peak;Valley Hold Input Words

Advanced Function Programming
3-6
SIMATIC 505–2556 Installation and Operation Guide
Internal Register Structures (continued)
Input registers WX49 – WX54 consist of special flag bits that may be
interrogated in the controller ladder program to detect alarm conditions,
overrange or underrange conditions, or arithmetic overflow conditions due
to scaling operations. See Figure 3-3.
WX49 Channel 1–16 Alarm flag bits
WX50 Channel 1–16 High alarm flag bits
WX51 Channel 1–16 Low alarm flag bits
WX52 Channel 1–16 Overrange flag bits
WX53 Channel 1–16 Underrange flag bits
WX54 Channel 1–16 Arithmetic overflow flag bits
WX55 Channel 1–16 Open Thermocouple flag bits
WX56 Channel 1–16 Front panel temperature
.WX64 Reserved for future use
For each word, the bits are correlated to the channels according to the following :
11600000000000000
MSB LSB
CH 1
.
.
.
CH 16
Figure 3-3 Input Flag Bits
If the peak or valley hold functions are enabled and Y31=1, then the data
returned in WX49 – WX64 is the peak (Y30=1) or valley (Y30=0) value
measured. See T able 3-3.
T able 3-3 Peak/V alley Hold Input W ords
WX 49 Channel 1 Peak/Valley value
. . .
. . .
WX 64 Channel 16 Peak/Valley value