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Communication Modules

PLC DeviceNet Scanner Module



The PLC DeviceNet scanner (1771-SDN) acts as an interface between DeviceNet devices and a PLC-5 processor. The DeviceNet scanner provides connections to two DeviceNet networks.

Input data gathered by the scanner from the two DeviceNet networks is block-transferred and single-transferred to PLC-5 processors. The size of the single-transfer depends on the 1771 I/O address mode: 1/2-slot addressing provides a maximum of 24 bits of input image and 24 bits out of output image, and 1-slot addressing provides up to 8 bits of input image and 8 bits of output image (2-slot addressing does not provide any single-transfer). Data to and from DeviceNet devices can be user-mapped into I/O image (as available) for single-transfer, or into areas for block-transfers.

The DeviceNet scanner is a single-slot module that can reside in a 1771 I/O chassis that either contains a PLC-5 processor or is on an extended-local I/O link, Universal Remote I/O link, or ControlNet network connected to a PLC-5 processor. The number of PLC-5 DeviceNet scanners that can reside in the same I/O chassis is limited only by the I/O chassis size, power supply capacity, and available memory.

Benefits

• Two channels allows connection to two DeviceNet networks.
  
• Connect up to 63 slave devices per channel.
  
• Can be run in slave mode.
  
• Install multiple scanners in a local I/O chassis or in an I/O chassis on an I/O link.
  
• Supports Auto Device Replacement (ADR).
  
• Uses producer-consumer technology to allow shared inputs between scanners without separate connections.
  
• Has a module reset pushbutton and a two-digit LED display for network and module status and diagnostics.
  
• Allows network access to scanner diagnostic tables such as idle, node status, and fault.
  
• Acts as an I/O data server for explicit peer-to-peer messaging.
  
• Communicates with PLC processors via bi-directional block-transfers and single-transfers.
  
• Can block-transfer a maximum of 358 words of input data and 358 words of output data (blocks of 62, 61, 60, 59, 58, and 57 words).
  
• Provides a maximum of 24 input image bits and 24 output image bits for single-transfer of high-priority I/O data, depending on I/O addressing density.
  
• DeviceNet time can be saved by not transferring I/O values unless a change-of-state (COS) has occurred.
  
• DeviceNet transfer of I/O data can be scheduled (cyclic data).
  

Specifications

Cat. No.	1771-SDN
DeviceNet Data	Strobe, poll, COS, or cyclic I/O data Configurable data parameters include: •Complete data mapping between block transfer and I/O image tables and DeviceNet devices •Background poll rate •Strobe or poll for each node
PLC Processor- to-Scanner Communication	Block Transfers: 242 input words / 242 output words
	Addressing 2-slot: 1-slot: 1/2-slot:	I/O Image Available 0 bits in / 0 bits out 8 bits in / 8 bits out 24 bits in / 24 bits out
Power Consumption	DeviceNet Current Load: 50 mA (max.) per channel Backplane Current Load: 0.8A @ 5V DC max.
Communication Rates	125 kbits/s, 250 kbits/s, 500 kbits/s
Messaging Capabilities	Master: Poll, strobe, COS, or cyclic Explicit: Initiate and respond
Isolation	Optical isolation between:   Backplane and channel 1   Backplane and channel 2   Channel 1 and channel 2 1 MW resistor from Channels 1 and 2 to chassis
Immunity Radiated Fields	10V/m, 27…1000 MHz
Module Location	1771-A1 / B to -A4 / B or later I/O chassis, any slot except leftmost slot
Network Address	00 - 63
Temperature, operating	0…60 °C (32…140 °F)
Temperature, nonoperating	-40…85 °C (-40…185 °F)
Relative Humidity	5…95% (without condensation)
Shock, operating Unpackaged (Category I / Category II)	30 g / 15 g
Shock, nonoperating Unpackaged (Category I / Category II)	50 g / 30 g
Vibration Unpackaged	2 g @ 10…500 Hz, 0.012 in. displacement (p-p)
Dimensions (HxWxD), Approx.	270 x 30 x 170 mm (10.6 x 1.2 x 6.7 in)
Weight	0.9 kg (1.9 lb)
Certifications¬	UL, CE, C-Tick, CSA Class I Div 2 Hazardous
¬ When product is marked. See the Product Certification link at http://www.ab.com for Declarations of Conformity, Certificates, and other certification details.