Operating instructions

Operating a project
8.4 Entries using the touch screen
MP 377, MP 377 PRO (WinCC flexible)
Operating Instructions, 10/2008, 6AV6691-1DR01-0AB0
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8.4.2 Entering and editing numerical values
Numerical screen keyboard
When you touch an operating element for numerical input on the HMI-device touch screen,
the numerical screen keyboard appears. This is the case, for example, for a text box. The
screen keyboard is automatically hidden again when input is complete.
Note
Opened screen keyboard
PLC job 51 "Select screen" has no effect while the screen keyboard is open.
Formats for numerical values
You can enter values in numerical text boxes based on the following formats:
● Decimal
● Binary
● Hexadecimal
Note
Entry of hexadecimal values
When you enter values in hexadecimal format, the alphanumerical screen
keyboard opens.
Checking numerical value limits
Tags can be assigned limit values. If you enter a value that lies outside of this limit, it will not
be accepted, for example, 80 with a limit value of 78. In this case the HMI device will deliver
a system alarm, if an alarm window is configured. The original value is displayed again.
Decimal places of numerical values
The configuration engineer can define the number of decimal places for a numerical text box.
The number of decimal places is checked when you enter a value in this type of I/O field.
● Decimal places in excess of the limit are ignored
● Empty decimal places are filled with "0"