Notes On Commissioning; Functional Ground; Connecting Functional Ground - Siemens SCALANCE XR-300M Operating Instructions Manual

5.2

Notes on commissioning

Note
Commissioning devices with redundancy mechanisms
If you use redundancy mechanisms ("HRP" media redundancy or "MRP" and/or redundant
coupling of rings over standby coupling), open the redundant path before you insert a new or
replacement device in an operational network. A bad configuration or attachment of the
Ethernet cables to incorrectly configured ports causes overload in the network and a
breakdown in communication.
A device may only be inserted in a network and connected in the following situations:
• HRP/MRP:
The ring ports of the device being inserted in the ring were configured as ring ports. The
required redundancy mode must also be enabled (see "Configuration Manual
SCALANCE X-300 / X-400", section "X-300 Ring Configuration"). If the device is intended
to operate as the redundancy manager, "Redundancy manager enabled" must also be
set.
• Standby coupling:
"Standby connection" must be "enabled" and the "Standby connection name" must match
the name of the partner device. You will also need to configure the port with "Enable
Standby Port Monitoring" (see "Configuration Manual SCALANCE X-300 / X-400", section
"X-300/X-400 Standby Mask").
5.3

Functional ground

5.3.1

Connecting functional ground

Optional grounding
Grounding (functional ground) is via the mounting bracket on the device or via the screw-in
bolts on the rear of the device. To ground the device from the back, follow the steps below:
1 toothed washer
2 grounding bolt
SCALANCE XR-300M
Compact Operating Instructions, 05/2016, A5E02661171-11
Connecting
5.2 Notes on commissioning
41