Siemens SENTRON PAC3120, Manual, Page: 32 / 160

Description
2.6 Ethernet interface (PAC3220 only)
30
PAC3120 and PAC3220
Equipment Manual, 10/2019, L1V30425208F-01
PAC3220 with RS485 expansion module
You can find information about setting parameters in the documentation for the SENTRON
PAC RS485 expansion module
( https://support.industry.siemens.com/cs/ww/en/view/28865965 ) under www.modbus.org
( http://www.modbus.org ) in the following specification: Modbus over Serial Line
( http://modbus.org/docs/Modbus_over_serial_line_V1_02.pdf ).
2.6 Ethernet interface (PAC3220 only)
Protocols
The Ethernet interface (PAC3220 only) allows communication via the following protocols:
● Modbus TCP
The device can be configured via Modbus TCP.
● Web server (HTTP)
The protocol can only be used to read out the measured values via web browser.
● SNTP
The SNTP (Simple Network Time Protocol) is used to automatically synchronize the
internal clock with a time server within the network. Three function modes are available:
– No synchronization
– Date/time synchronization via device request
The IP address of an NTP server must be configured. With this, the SENTRON
PAC3220 automatically requests the current time from the server and resets its
internal clock, if necessary.
– Date/time synchronization via SNTP server (BCST)
The PAC3220 receives broadcast time frames which are sent from an NTP server.
This is useful if the internal clocks of several devices in the same network need to
remain synchronized.
If the IP address of the NTP server has been configured, the PAC3220 only responds to
these frames. Furthermore, it can itself send a request to the server if necessary.
● DHCP
DHCP stands for "Dynamic Host Configuration Protocol". Protocol for obtaining network
settings from a DHCP server. Network settings are assigned automatically.