The IC086SLM244LL is the top-tier aggregation switch in Emerson's PACSystems industrial Ethernet portfolio — a 28-port Layer 3 managed Gigabit switch in a 1U rack-mount form factor. It is the only IC086 model with hardware-based IP routing, making it the natural choice for plant-wide backbones that require inter-VLAN segmentation, gateway redundancy, or integration of the factory network with enterprise IT systems.

What makes this a Layer 3 switch, and when does an industrial network need routing?

A Layer 2 switch forwards traffic based on MAC addresses within a single broadcast domain — sufficient for a machine-level network where all devices belong to the same subnet. A Layer 3 switch adds IP-based routing between subnets, VLANs, or network segments. The SLM244LL implements this in hardware at wire speed, supporting static routes, RIP, and OSPF v2 dynamic routing protocols. VRRP provides gateway redundancy — two SLM244LL switches can share a virtual IP address, and if the primary fails, the standby takes over the default gateway role without requiring endpoint reconfiguration. This is critical in plant architectures where the factory network segments production cells, material handling, and supervisory systems into separate VLANs for performance and security, yet all must reach the SCADA and MES layers.

Modular architecture and 10 Gigabit expansion

The switch chassis has four internal slots. Three accept 8-port 1G modules — pre-populated for the standard 24-port copper configuration. The fourth slot can accept a 4-port 10G SFP+ module (sold separately), adding IEEE 802.3ae 10 Gigabit Ethernet uplinks for high-bandwidth backhaul to a central control room or data center. When the 10G module is installed, the maximum ambient operating temperature derates from +70°C to +60°C to account for the additional SFP+ transceiver heat dissipation. IEEE 1588v2 Precision Time Protocol (PTP) support enables clock synchronization across the network for time-sensitive applications such as event sequencing and motion coordination.

How does the SLM244LL compare to the SLM162?

Both are 1U rack-mount managed switches in the PACSystems IC086 family, but they serve different network tiers. The SLM162 is a Layer 2 switch with 16×RJ45 + 2×Gigabit Combo ports and a 5.6 Gbps backplane — positioned as an edge aggregation switch for connecting device-level equipment. The SLM244LL adds 8 more copper ports (24 total), doubles the Combo uplinks to 4, scales the backplane to 128 Gbps, and introduces full Layer 3 routing and modular 10G expansion. Power supply also shifts from DC-only (12–48 VDC) on the SLM162 to wide-range AC/DC (88–264 VAC / 100–370 VDC) on the SLM244LL — reflecting its role in infrastructure racks served by AC distribution panels rather than machine-level DC buses.