System variables and status information
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8.3 System time
The RTC system variable is a system variable organized as a data structure. The RTC sys-
tem variable can be used to retrieve information on the system time of the device‘s internal
real-time clock.
8.4 Power supplies
8.5 TCP_SOCKET, UDP_SOCKET, and TLS_SOCKET
function blocks
You can use the TCP_SOCKET and UDP_SOCKET function blocks 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 that are used
for secure IP communication via TLS (Transport Layer Security).
You can retrieve the number of opened IP sockets using the following system variables:
Table 8-1 RTC system variable (RTC_TYPE data structure) and the system variables it contains
System variable Typ e Description
RTC RTC_TYPE Data structure
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 8-2 Power supply system variables
System variable Typ e Description
POWER_SUPPLY_MAIN_OK BOOL The 24 V main power supply is OK.
UPS_BATTERY_OK BOOL Full capacity of the energy storage for the undervoltage buff-
ering
Table 8-3 System variables for the TCP_SOCKET, UDP_SOCKET, and TLS_SOCKET function blocks
System variable Typ e Description
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 func-
tion block
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