Pilz PSSnet SHL 8T MRP - Manual (Page 51)

Time
PSSnet SHL - Web- based Interface
Pilz GmbH & Co. KG, Felix- Wankel Str. 2, 73760 Ostfildern
51
3 Time
With this dialog you can enter time-related settings independently of the time
synchronization protocol selected.
X The “IEEE/SNTP time” displays the time with reference to Universal Time
Coordinated (UTC).
The time displayed is the same worldwide. Local time differences are not
taken into account.
X The “System time” uses the “IEEE 1588 / SNTP time”, allowing for the
local time difference from “IEEE 1588 / SNTP time”.
“System time” = “IEEE 1588 / SNTP time” + “Local offset”.
X “Time source” displays the source of the following time data. The device
automatically selects the source with the greatest accuracy.
With “Set time from PC”, the device takes the PC time as the system time
and calculates the IEEE 1588 / SNTP time using the local time difference.
“IEEE 1588 / SNTP time” = “System time” - “Local offset”
X The “Local Offset” is for displaying/entering the time difference between
the local time and the “IEEE 1588 / SNTP time”.
With “Set offset from PC”, the agent determines the time zone on your PC
and uses it to calculate the local time difference.
Note: When setting the time in zones with summer and winter times, make
an adjustment for the local offset. The device can also get the SNTP server
IP address and the local offset from a DHCP server.
Interaction of PTP and SNTP
According to PTP (IEEE
1588) and SNTP, both protocols can exist in parallel
in the same network. However, since both protocols affect the system time of
the device, situations may occur in which the two protocols compete with
each other.