System variables
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8.4 System time
The RTC system variable uses the RTC_TYPE structure to provide information about the
system time.
8.5 PLC_CRC_PRJ
The PLC_CRC_PRJ system variable provides information about the CRC of the non-safety-
related project.
8.6 TCP_SOCKET, UDP_SOCKET, and TLS_SOCKET
function blocks
The TCP_SOCKET and UDP_SOCKET function blocks are used to open and close the IP
sockets that are used for IP communication via TCP (Transmission Control Protocol) or via
UDP (User Datagram Protocol). You can use the TLS_SOCKET function block to open and
close IP sockets, which are used for secure IP communication via TLS (Transport Layer
Security).
You can request the number of opened IP sockets using the following system variables:
Table 8-10 RTC system variable and elements of the RTC_TYPE structure
System variable/elements Ty pe Meaning
RTC RTC_TYPE The structure provides information about the realtime clock inside the
device.
HOURS USINT System time (hours)
MINUTES USINT System time (minutes)
SECONDS USINT System time (seconds)
DAY USINT System time (day)
MONTH USINT System time (month)
YEAR UINT System time (year)
Table 8-11 PLC_CRC_PRJ system variable
System variable Ty pe Meaning
PLC_CRC_PRJ UINT Information about the CRC of the non-safety-related project
Table 8-12 System variables for the TCP_SOCKET, UDP_SOCKET, and TLS_SOCKET function blocks
System variable Ty p e Meaning
IP_ACTIVE_SOCKETS UINT Number of IP sockets opened using the TCP_SOCKET
and UDP_SOCKET function blocks
TLS_ACTIVE_SOCKETS UINT Number of IP sockets opened using the TLS_SOCKET
function block
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