Features:
- Two local Ethernet ports feed one cellular routing path.
- The exact -2FA2 ordering number is the China-approved M874-3 variant.
- Firewall and VPN rules govern traffic crossing the mobile link.
The local switch keeps two automation devices on the same Ethernet side of the router.
Mobile traffic leaves through the SMA-connected HSPA+/UMTS interface after the configured routing and address translation.
Isolated input and relay output signals can connect cabinet status logic without sharing the router electronics.
The Siemens 6GK5874-3AA00-2FA2 SCALANCE M874-3 3G Router may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Siemens 6GK5874-3AA00-2FA2 SCALANCE M874-3 3G Router Manuals,Datasheets,Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Moving automation traffic through the 3G path
- Local side: Two RJ45 ports connect Ethernet automation devices to the internal switch.
- Radio side: The SMA antenna connection serves the HSPA+/UMTS and GSM path.
- Address handling: NAT and port-forwarding rules decide how local addresses and services appear across the mobile network.
- Country variant: The -2FA2 ordering number identifies the documented China approval of M874-3.
Controlling access across an untrusted mobile network
- State inspection: The firewall checks layer-three and layer-four connection state before forwarding traffic.
- Encrypted paths: IPsec tunnels and OpenVPN client mode protect selected remote connections.
- Connection scale: The documented VPN configuration allows up to twenty connections.
- Remote service: SINEMA Remote Connect client functions can place the router in a managed remote-access path.
Linking network operation with cabinet status wiring
- Digital input: One isolated 24 V DC input receives a binary cabinet condition.
- Relay output: One isolated output can switch an external status circuit up to its documented load.
- Power path: A five-pin terminal accepts the router's 12 to 24 V DC supply.
- Cable limits: Supply and digital-signal wiring follow the documented maximum cable lengths.
Separating browser and command-line administration
- Web interface: HTTP or HTTPS WBM presents the router settings in a browser.
- Command line: Telnet or SSH provides CLI access for text-based administration.
- Monitoring: LED states, event logging and SNMP expose operating and diagnostic information.
- Time services: NTP, secure NTP, SIMATIC time and SNTP options align event timestamps.