Application Scenarios
A bottling line built in the late 1990s ran a SLC 5/04 with a mix of 1746 I/O and a growing collection of DeviceNet devices: a PowerFlex drive on the infeed, a valve manifold on the filler, and a remote I/O block on the capper. Each device had been added with its own interface, and the panel had three different wiring standards and two different termination styles. When a node dropped off the network, the maintenance team spent the first hour deciding which interface was responsible.
Fitting the 1747-SDN A put all three devices on one DeviceNet trunk. The scanner polls the nodes on a fixed schedule, so the SLC program receives the drive status, the valve positions and the remote I/O in the same block-transfer read; when a node faults, the module’s status information identifies which node it is. The line now has one trunk, one terminator at each end, one set of wiring rules and one spare module on the shelf. The electrician still checks the same four things — power, termination, address, cable — but he checks them on one network instead of three.
Parameter
| Main Parameters | Value / Description |
|---|---|
| Product Model | 1747-SDN A (Series A) |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Product Category | DeviceNet scanner (master) module for SLC 500 |
| Network Protocol | DeviceNet (CIP-based fieldbus over CAN) |
| Communication Rate | 125 kbit/s, 250 kbit/s, 500 kbit/s (selectable) |
| Network Medium | DeviceNet trunk and drop cables, 5-pin Phoenix-style connectors |
| Node Addressing | Rotary switch or software-configured node address (0…63); scanner typically at address 0 or 63 |
| Maximum Nodes | 64 per network (theoretical maximum; practical limit lower) |
| Practical Node Limit | 20 nodes recommended for reliable operation |
| Network Power | Supplied by the 1747-SDN A; external power supply may be required for larger networks |
| Network Power Rating | 2 A @ 24 V DC |
| Backplane Power | 1.1 A @ 5 V DC; 0.35 A @ 24 V DC |
| Power Dissipation | 6.8 W (23.2 BTU/hr) |
| Isolation | 500 V AC (field to backplane), 1500 V AC (field to ground) |
| Status Indicators | 3 × LED (module status, network status, network activity) |
| Diagnostic Information | Module status, network status, last scanned node, number of nodes scanned, bus errors |
| Configuration Method | DeviceNet configuration software (e.g. RSNetWorx for DeviceNet) plus ladder file configuration |
| Data Transfer Method | M0/M1 file block transfers (BTR/BTW instructions) |
| Compatible Processors | SLC 5/03 and later (5/03, 5/04, 5/05) with M0/M1 file capability |
| Unsupported Processors | SLC 5/01, 5/02 (no M0/M1 files) |
| Chassis Slots | 1 (single-width module) |
| Dimensions (H × W × D) | 139 × 30 × 140 mm (5.47 × 1.18 × 5.51 in) |
| Weight | 0.61 kg (1.34 lb) |
| Operating Temperature | 0 … 60 °C (32 … 140 °F) |
| Storage Temperature | -40 … 85 °C (-40 … 185 °F) |
| Relative Humidity | 5 … 95 % non-condensing |
| Shock / Vibration | 30 g operating, 50 g non-operating; 2 g at 10 … 500 Hz |
| Enclosure Type | Open-style module |
| Certifications | UL 508, cUL, CE, C-Tick, ATEX, FM, KC, IECEx, ABS marine |
| Country of Origin | United States |
| Lifecycle | Discontinued by Rockwell Automation; available as surplus, refurbished and repair stock |
