03/05 AWB2724-1453GB
CPU
15
Table 3: Cable cross-section, bus length and number of bus slaves
conform to ISO 11898
If the bus length is greater than 250 m and/or are more than 64
slaves connected, the ISO 11898 demands a residual ripple of the
supply voltage of ≤ 5%.
As the bus cable is connected directly to the COMBICON connector
of the CPU, additional details concerning stub lines are not
required.
The bus users are configured in the “PLC Configuration” window
of the CPU in the “XSoft” programming software.
Cable recommendation:
LAPP-Cable
UNITRONIC-BUS LD
Real-time clock
The XC100 features a real-time clock, which can be referenced in
the user program via the functions from the “SysLibRTC” library.
Possible functions are:
• Display of the battery charge state
• Display mode for hours (12/24 hour display)
• Reading and setting of the real-time clock.
A description of the functions can be found in the “SysLibRTC.pdf”
file. The PDF file will be filed in the
“...\XSoft2.3\Dok\Deutsch\XSoftSysLibs” directory during
installation of the CD.
XC-CPU101-...-XV
The XC-CPU101-...-8DI-6DO- XV units are equipped with an
expandable operating system. The functionality of the system
permits operation of these CPUs with text displays from the XV-
101-.. series.
Battery
A lithium battery, type 1/2 AA (3.6 V) is used for data-saving. The
battery compartment can be found on the left side of the CPU unit,
behind a cover plate. The charge level of the battery is monitored.
If the battery voltage falls below a fixed preset level, then a
general error message will be generated.
The battery buffer times are:
• Worst-case: 3 years continuous buffering
• Typical: 5 years of continuous buffering
Ordering designation of the battery: XT-CPU-BAT-1
Cable cross-section [mm] Maximum length [m]
n = 32 n = 64 n = 100
0,25 200 170 150
0,5 360 310 270
0,75 550 470 410
n = number of connected bus users
h
For the XC100 the “GetRealTimeClock” (evaluation of the
real-time clock) and “SetRealTimeClock” (setting of the
real-time clock) function blocks can continue to be used.
However, they are not supported by the XC200 and XN-
PLC-CANopen controls.
More information about the function blocks can be found
in the separate “Function blocks for XSoft” (AWB2786-
1456) manual.
h
The text displays are described in the separate manual
“Hardware and Engineering“ (AWB2726-1461GB).
h
Important
To avoid loss of data, the battery must be changed when
the low threshold level has been reached.
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