Overview

The library contains useful function blocks for the PLC controller ( BCxxxx controller ). In addition to the RTC blocks, the library contains a function block for decoding the DCF-77 time signal, along with a number of conversion functions. Internally, PLC Controller system functions are called.

Requirements

Some of the functions are only supported by PLC controllers with a newer firmware version. The required firmware versions are listed in the PlcSystemBC library documentation.

Content of the library

Function blocks

Name	Description
RTC	Real Time Clock
RTC_EX	Real Time Clock with an additional millisecond output
DCF77_TIME	Read the DCF77 radio time
ReadWriteTerminalReg	Access to the registers of the terminals
DRAND	Random number generator
FB_BasicPID	Simple PID controller

Functions

Name	Description
DT_TO_SYSTEMTIME	Converting DATE_AND_TIME to Windows system time structure
SYSTEMTIME_TO_DT	Converting Windows system time structure to DATE_AND_TIME
TIME_TO_OTSTRUCT	Convert TIME to a structure with milliseconds, seconds, minutes, hours, days and weeks
OTSTRUCT_TO_TIME	Convert a structure with milliseconds, seconds, minutes, hours, days and weeks to a TIME variable
SETBIT32	Sets a bit in a 32-bit variable to 1
CSETBIT32	Sets / resets a bit in a 32-bit variable
GETBIT32	Determines the value of a bit of a 32-bit variable
CLEARBIT32	Sets a bit in a 32-bit variable to zero
F_SwapReal	Converts bus controller REAL numbers into the 4Byte REAL Intel format.
IsFinite	Verifies the formatting of a floating-point number in accordance with the IEEE

Data structures

Name	Description
TYPE TIMESTRUCT	Windows system time structure
TYPE OTSTRUCT	Operating time structure