1783-LMS8 — Stratix 2000 Managed 8-Port Industrial Ethernet Switch

The 1783-LMS8 is an 8-port managed industrial Ethernet switch from the Stratix 2000 series, combining DIN rail mounting, 24V DC power input, and a managed switch feature set designed for EtherNet/IP machine networks. Unlike the unmanaged 1783-US8T, this switch is configurable — VLANs, QoS traffic prioritization, IGMP snooping for multicast management, port mirroring, and SNMP-based network diagnostics are all available through the web-based management interface.

For most small machines with a handful of devices on one flat network, a managed switch adds unnecessary complexity. For machines with more demanding network requirements — motion control where CIP Motion traffic needs priority, multi-zone systems where VLAN segmentation improves security, or any installation where network diagnostics and traffic visibility matter — the managed feature set pays for the additional setup effort.

Specifications

Parameter	Value
Part Number	1783-LMS8
Series	Stratix 2000
Ports	8 × RJ-45, 10/100 Mbps
Management	Web browser, CLI, SNMP v1/v2c/v3
VLANs	Yes (802.1Q, up to 256 VLANs)
QoS	Yes (802.1p priority queuing)
IGMP Snooping	Yes (v1, v2)
Port Mirroring	Yes (1 monitor port)
DLR Support	Yes (ring supervisor capable)
Spanning Tree	STP, RSTP (802.1w)
Power Input	24V DC (18–32V DC)
Power Consumption	6W typical
Mounting	35 mm DIN rail
Enclosure	IP20
Operating Temperature	−10°C to 60°C
Standards	UL 508, CE, ATEX Zone 2

Managed vs. Unmanaged — The Practical Decision

The question isn't which is better in the abstract — it's what the application actually needs. An unmanaged switch is correct for a simple machine network with a controller, HMI, and two drives. It's transparent, requires no setup, and introduces nothing to misconfigure.

The 1783-LMS8 is appropriate when any of the following apply:

CIP Motion with fast RPIs: QoS ensures servo control traffic isn't delayed by standard I/O or HMI traffic sharing the same physical network.
DLR ring supervision: the switch can act as the DLR ring supervisor, managing ring topology, detecting cable faults, and rerouting traffic on a break.
VLAN segmentation: separating the control network from a maintenance or IT network on the same physical switch while preventing cross-network traffic.
Network diagnostics: port mirroring captures traffic to a monitoring PC for protocol analysis; SNMP provides port-level traffic statistics; event logs record link-state changes for intermittent fault diagnosis.

FAQ

Q: Can the 1783-LMS8 be configured in Studio 5000?

No. The Stratix 2000 series is configured through its own web interface or CLI, not through Studio 5000. Higher-tier Stratix switches (5700, 5400) support Studio 5000 configuration; the 2000 series does not.

Q: Does VLAN configuration affect EtherNet/IP I/O performance?

Properly configured VLANs don't degrade I/O performance. Keep all EtherNet/IP control devices on the same VLAN to ensure multicast and implicit messaging work correctly. Routing between VLANs introduces latency that is incompatible with real-time I/O control.

Q: Is a managed switch required for DLR topology?

A DLR ring supervisor is required — either this switch or a compatible EtherNet/IP communication module in the controller chassis. If the controller's EtherNet/IP module supports ring supervision, an unmanaged switch at the ring head is acceptable for some DLR architectures, but the managed switch provides more visibility and control over ring status.

Q: What is the switch's latency for real-time I/O traffic?

Switching latency for 100 Mbps packets is typically under 10 μs in store-and-forward mode. For EtherNet/IP I/O with RPIs of 5 ms or longer, this latency is negligible. CIP Motion applications with sub-millisecond RPIs should verify latency against the motion system's timing requirements.

1783-LMS8 New Sealed 1783LMS8 /A Stratix 2500 8-Port Ethernet Switch