Allen-Bradley · Stratix 5200
Allen-Bradley 1783-CMS20DP / 1783-CMS20DN Stratix 5200 20 Port Managed Switches
20-port managed switch pair
Product Profile
Within a Stratix 5200 control-network layer, Allen-Bradley 1783-CMS20DP and 1783-CMS20DN provide the same high-port-density managed switching foundation for machine cells, cabinet-to-cabinet links, and network segments that combine copper devices with uplink media. Their shared role is to collect industrial Ethernet connections while retaining management and resilience functions at the switch layer.
The pair belongs to the same Stratix 5200 system family and uses the same twenty-port hardware class. This makes the models relevant where a project needs a stable managed-switch architecture rather than an unmanaged distribution block, with network services controlled through the selected catalog configuration.
The common Device Level Ring capability supports ring-based industrial network design. The difference is functional scope: 1783-CMS20DN adds Parallel Redundancy Protocol and Network Address Translation, while 1783-CMS20DP remains the DLR managed-switch variant. A design that uses PRP or NAT therefore requires the DN model to remain explicit in the configuration record.
Technical Specifications
| Specification | 1783-CMS20DP / 1783-CMS20DN |
|---|---|
| Brand | Allen-Bradley |
| Product family | Stratix 5200 managed Ethernet switches |
| Models covered | 1783-CMS20DP / 1783-CMS20DN |
| Total ports | 20 |
| Copper interfaces | 18 x 10/100/1000Base-T |
| Dual-purpose positions | 2; RJ45 or approved SFP, one active interface per position |
| Switching capability | Managed; Device Level Ring |
| 1783-CMS20DP distinction | DLR managed switch |
| 1783-CMS20DN distinction | DLR, PRP and NAT |
| Power input | 12...48 V DC nominal; 4.2 A maximum |
| Power consumption | 36.7 W |
| Alarm relay | 30 V DC, 1 A or 60 V DC, 0.5 A resistive |
| Mounting | Vertical DIN rail |
| Operating temperature | -40 to 60 °C (-40 to 140 °F) |
| Enclosure type | Open-style |
Cabinet wiring and alarm preparation
System focus
Cabinet wiring and alarm preparation
Before a CMS20DP or CMS20DN is energized, mount it vertically on the DIN rail, bond the designated ground connection, and route the 12...48 V DC supply separately from noisy field conductors. The installation instructions also reserve the front-panel power and alarm connectors for accessible service, rather than allowing cable dressing to block them.
The switch provides two alarm inputs and one Form C alarm-output relay. A commissioning record should identify which external circuit uses IN1/IN2 and which contact uses the N.O., N.C. or COM relay path, so an alarm issue is not mistaken for a network-port fault.
- 12...48 V DC nominal supply
- Two inputs + one Form C alarm output
- Vertical DIN-rail installation
Dual-purpose port and SFP discipline
Technical reference
Dual-purpose port and SFP discipline
Each dual-purpose position combines an RJ45 interface and an approved SFP location, but only one interface may be active at a time. The copper-versus-fiber choice must therefore be recorded for both positions before the cable schedule and SFP order are released.
After an SFP connection is made, the port can show amber while the device discovers topology and checks for loops; the instruction gives approximately 30 seconds before normal green link status. This observed startup state should not be escalated as a hardware failure prematurely.
- 18 fixed copper ports
- 2 RJ45-or-SFP positions
- Allow topology discovery before faulting
Frequently Asked Questions
In a DLR plant expansion, why must the drawing name 1783-CMS20DP / 1783-CMS20DN exactly?
Both 1783-CMS20DP and 1783-CMS20DN provide DLR, but 1783-CMS20DN also lists PRP and NAT. The catalog suffix therefore identifies a network-service boundary, not a cosmetic revision.
When an existing cabinet calls for 20 connections, which 1783-CMS20DP / 1783-CMS20DN ports need separate planning?
1783-CMS20DP and 1783-CMS20DN have eighteen copper 100/1000 ports plus two 100/1000 combo ports. The combo positions must be assigned as the intended connection type rather than counted as identical copper-only ports.
How should a control engineer avoid a NAT feature gap with 1783-CMS20DP / 1783-CMS20DN?
The NAT requirement must be matched to 1783-CMS20DN because that feature is listed for the DN model. 1783-CMS20DP should not be substituted on the basis of the shared DLR and port-count description.
What enclosure review is needed before fitting 1783-CMS20DP / 1783-CMS20DN near process heat?
1783-CMS20DP and 1783-CMS20DN are specified for an IP30 environment and -40 to 60 °C operation. The enclosure and its thermal condition must support those values before the switches are energized.
During a migration, what remains common between 1783-CMS20DP / 1783-CMS20DN?
1783-CMS20DP and 1783-CMS20DN share a Stratix 5200 managed-switch role, eighteen copper ports, two combo ports, and DLR capability. The selection changes when PRP or NAT is part of the documented network need.
Which mounting assumption is safe for 1783-CMS20DP / 1783-CMS20DN?
Both 1783-CMS20DP and 1783-CMS20DN are listed for DIN-rail mounting. The rail installation does not remove the need to maintain the specified IP30 cabinet environment.
Moore Automation
Moore Automation
Application enquiry review
For a managed-network enquiry, Moore Automation can begin with the exact switch suffix, port plan and intended network services. This keeps a request for DLR, PRP or NAT aligned to the catalog number supplied.
- Original products
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- 1-year warranty
- 12-hour online response
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