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Siemens
HMI-LED
CB1P3946en
Building Technologies
HMI-LED Programming
2013-08-19
Pressing key SET+DOWN will write value “1” to the Holding register 138. Then a
2-second pulse will be created.
4.2.3 Alarm history records clean up
On the alarm history page, press and hold key SET+ESC to clear all the history
alarm records.
Pressing key SET+ESC will write value “1” to the Holding register 139. Then a 2-
second pulse is created.
4.3 Display value configuration
The following displayed values need to be assigned to the input register according
to the Modbus register list (refer to
Chapter 5 Appendix - Modbus register list).
4.3.1 Temperature display
The engineering unit of temperature displayed on the HMI-LED screen is “°C”.
For example, for controller “B1” which connects to NTC sensor, there is a
temperature variable as below.
The temperature variable is sent to the Input register 2, and the “VL_Unit” needs
to be defined as “1”. If the temperature variable is with one factional digital, the
“VL_Factional” should also be defined as “1”.
