Communication Modules

1771 Communication Modules

In addition to the on-board ports available with PLC-5 processors, you have the option of providing another communication port for a PLC-5 processor by adding a communication module.

Communication Modules

Cat. No.	Description	Communication with PLC Processor	Operation	Communication Port Protocol
1785-ENET	PLC-5 EtherNet/IP™ Interface Module	Direct connection to channel 3 of a PLC-5 processor	Process messages	EtherNet/IP
1771-DB	PLC BASIC Module	Block-transfer with PLC-5 processor	•BASIC programs •C programs	•RS-232-C •RS-422-A •RS-485 •DH-485
1771-SDN	PLC DeviceNet Scanner Module	Block-transfer with PLC-5 processor	•Scan I/O •Process messages	DeviceNet

PLC-5 EtherNet/IP™ Interface Module



The Allen-Bradley PLC-5 EtherNet/IP Interface Module (1785-ENET Series C) adds an Ethernet port to a PLC-5 processor. This port provides embedded TCP/IP communication capabilities that lets the PLC-5 processor communicate with other PLC-5 processors with Ethernet ports and with host computers. Adding this Ethernet port onto these PLC-5 processors provides the integration of Allen-Bradley architecture into the industry-standard TCP/IP network, offering flexible open-system solutions.

This interface module adds a second Ethernet port to an existing Ethernet PLC-5 processor. This interface module plugs into the side of the PLC-5 processor and takes up the first I/O module slot.

Benefits

• 10/100 MB high-performance peer-to-peer auto negotiate communication via an Ethernet port using PLC-5 message instructions.
  
• Through Rockwell Software RSLinx™ or INTERCHANGE Software in a computer with OpenVMS, Windows, or HP-UX operating systems, application programs can communicate directly across an EtherNet/IP network to PLC-5 processors with Ethernet ports.
  
• Programming locally (RS-232 or DH+) or remotely (DH+ or EtherNet/IP) via Rockwell Software programming software.
  
• Standard Simple Network Management Protocol support for network management.
  
• Supports remote I/O pass-through commands.
  
• Event driven e-mail messages using ESMTP (requires RSLogix 5 V7.0 or later).
  
• RJ45 connector allows direct connection to CAT5 network cabling.
  

Built-in Web Services

Ethernet PLC-5 processors (1785-L20E, -L40E, and -L80E), and the EtherNet/IP interface module (1785-ENET) provide built-in web capabilities:

• Web Diagnostics and Module Information lets a standard web browser access information stored in the PLC-5 processor data table, including module diagnostic information (requires RSLogix5, version 5.2 or later).
  
• Web User Provided Pages allow for unique Web page creation to provide custom data table information. Any Internet user who has network access to the PLC-5 processor can view these pages, which can be either HTML pages that contain data table elements, text and images, or Custom Data Monitor pages that contain data table elements in table form.
  
• Domain Name Service (DNS) lets Internet users access the built-in Web server by a specified name instead of by IP address (requires RSLogix5, version 5.2 or later).
  

Typical Configuration



Specifications

Cat. No.	1785-ENET
Temperature, operating	0…60 °C (32…140 °F)
Temperature, nonoperating	-40…85 °C (-40…185 °F)
Relative Humidity	5…95% (without condensation)
Shock, operating	30 g peak/11 ms
Shock, nonoperating	50 g peak/11 ms
Vibration	2 g @ 10…500 Hz, 0.012 in. peak-to-peak displacement
Backplane Current Load	1.0 A @ 5V DC
Weight	0.77 kg (1.7 lb)
Compatibility	All 1771-platform PLC-5 processors except the classic PLC-5 processors and the series A PLC-5/40 and PLC-5/60 processors¬
CertificationsT	UL, CSA, CE, C-Tick, EEx
¬ For more information on compatibility, see the PLC-5 Ethernet Interface Module User Manual. T When product is marked. See the Product Certification link at http://www.ab.com for Declarations of Conformity, Certificates, and other certification details.

PLC BASIC Module



The PLC BASIC Module (1771-DB) occupies one slot in the 1771 I/O chassis and runs user-written BASIC and C programs. These programs are independent of the PLC processor and provide an easy, fast interface between a PLC processor, 1771 backplane and RS-232, -422, or -485 devices. The BASIC module can also communicate with a remote SLC processor or remote device on the DH-485 network through a DH-485 port.

The PLC BASIC Module allows for:

• Creation of an interface between foreign device and the PLC processor.
  
• Manipulation and analysis of data gathered from the PLC and SLC processors.
  
• Communication with devices requiring remote communication, such as computers, modems, printers, and other third party devices.
  
• Calculation of complex math or application-specific algorithms, which helps conserve valuable PLC processor memory.
  
• Generation of unattended reports.
  

Configure the two ports for RS-232, -422, or -485 communication. The third port is for DH-485 communication or programming. The module provides up to 32K bytes of battery-backed RAM, and 24K bytes are available for user programs. With the BASIC Module, up to 32K bytes of EEPROM (optional) is available. The module also contains a time-of-day clock/calendar with 10 ms resolution.

To facilitate program development, order BASIC Development Software (1771-PBASE). This package runs on an IBM-compatible computer and lets users create, edit, translate, debug, upload, and download programs to the BASIC Module. Although the primary programming language is BASIC, both a C compiler and a C Toolkit from one of the Encompass Program partners is available in the C programming language.

Benefits

• Block-transfer capability minimizes user programming by allowing the module to transfer entire files of data back and forth between the module’s memory and the processor’s data table.
  
• The module supports BASIC commands and statements, and an additional 128 calls specific to the BASIC Module.
  
• The module has two ports configurable for RS-232, -422, or -485 communication. The third port is for DH-485 communication or programming.
  

Typical Applications

The BASIC Module interfaces to:

• Any device that needs an RS-232, -422, or -485 interface to a 1771 backplane
  
• Bar-code readers
  
• Scales
  
• Displays
  
• Modems
  
• Printers
  
• Robots
  
• Weld controls (for protocol conversion)
  

Specifications

Cat. No.	1771-DB
Isolation	500V DC from port-to-port and port-to-backplane
Communication rates	300, 600, 1200, 2400, 4800, 9600 or 19.2 kbit/s
Communication rates versus distance in feet	RS-232-C: 300…19.2 Kbps: 15 m (50 ft)
	RS-422: 300…19.2 Kbps: 1230 m (4,000 ft)
	RS-485: 300…19.2 Kbps: 1230 m (4,000 ft)
Time-of-day clock accuracy	Resolution 1s; ±1 minuten/month @ 25 °C +0, -6 minute @ 60 °C
Real-time clock	Resolution 10 ms; better than 0.1% accuracy
Backplane current load	0.75 A - with a DH-485 Interface/Converter (1747-PIC) connected to the DH-485 port
	0.65 A - without a device connected to the DH-485 port
Indicators	8 defined indicators 2 user-defined indicators
Certifications¬	UL, CSA Class I Div 2 Hazardous, CE
¬ When product is marked. See the Product Certification link at http://www.ab.com for Declarations of Conformity, Certificates, and other certification details.

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.