Installation Instructions AC (24V) Input Module Cat. No. 1771-IN Contents Important User Information 1 Use this document as a guide when installing the catalog number 1771-IN ac input module. To: See Page: Important User Information 1 Preinstallation Considerations 3 Calculate Power Requirements 4 Key the Backplane Connector 4 Install the Field Wiring Arm 4 Connect Wiring to the Field Wiring Arm 5 Interpret the Status Indicators 7 Specifications 8 Rockwell Automation Support BackCover Solid state equipment has operational characteristics differing from those of electromechanical equipment. Safety Guidelines for the Application, Installation and Maintenance of Solid State Controls (Publication SGI-1.1 available from your local Rockwell Automation sales office or online at http://www.ab.com/manuals/gi) describes some important differences between solid state equipment and hard-wired electromechanical devices. Because of this difference, and also because of the wide variety of uses for solid state equipment, all persons responsible for applying this equipment must satisfy themselves that each intended application of this equipment is acceptable. In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages resulting from the use or application of this equipment. The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many variables and requirements associated with any particular installation, Rockwell Automation, Inc. cannot assume responsibility or liability for actual use based on the examples and diagrams. Publication 1771-IN082A-EN-P - February 2005 2 AC (24V) Input Module No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits, equipment, or software described in this manual. Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell Automation, Inc. is prohibited. Throughout this manual we use notes to make you aware of safety considerations. Identifies information about practices or circumstances WARNING that can cause an explosion in a hazardous environment, which may lead to personal injury or death, property damage, or economic loss. IMPORTANT ATTENTION Identifies information that is critical for successful application and understanding of the product. Identifies information about practices or circumstances that can lead to personal injury or death, property damage, or economic loss. Attentions help you: • identify a hazard • avoid a hazard • recognize the consequence Publication 1771-IN082A-EN-P - February 2005 AC (24V) Input Module ATTENTION 3 Environment and Enclosure This equipment is intended for use in a Pollution Degree 2 industrial environment, in overvoltage Category II applications (as defined in IEC publication 60664-1), at altitudes up to 2000 meters without derating. This equipment is considered Group 1, Class A industrial equipment according to IEC/CISPR Publication 11. Without appropriate precautions, there may be potential difficulties ensuring electromagnetic compatibility in other environments due to conducted as well as radiated disturbance. This equipment is supplied as "open type" equipment. It must be mounted within an enclosure that is suitably designed for those specific environmental conditions that will be present and appropriately designed to prevent personal injury resulting from accessibility to live parts. The interior of the enclosure must be accessible only by the use of a tool. Subsequent sections of this publication may contain additional information regarding specific enclosure type ratings that are required to comply with certain product safety certifications. See NEMA Standards publication 250 and IEC publication 60529, as applicable, for explanations of the degrees of protection provided by different types of enclosure. Also, see the appropriate sections in this publication, as well as the Allen-Bradley publication 1770-4.1 ("Industrial Automation Wiring and Grounding Guidelines"), for additional installation requirements pertaining to this equipment. ATTENTION Preinstallation Considerations Preventing Electrostatic Discharge This equipment is sensitive to electrostatic discharge, which can cause internal damage and affect normal operation. Follow these guidelines when you handle this equipment: • Touch a grounded object to discharge potential static. • Wear an approved grounding wriststrap. • Do not touch connectors or pins on component boards. • Do not touch circuit components inside the equipment. • If available, use a static-safe workstation. This module contains filtering to limit the effects of voltage transients caused by contact bounce and/or radiated electrical noise. The delay due to filtering is nominally 18ms (+10ms) for turning ac inputs on or off. This module is designed to operate with ac proximity switches and other input devices with an off-state leakage current less than 2.8mA peak. Publication 1771-IN082A-EN-P - February 2005 4 AC (24V) Input Module Calculate Power Requirements The module receives its power through the 1771 I/O chassis backplane from the chassis power supply. The module requires 80mA from the output of this supply . Add this current to the requirements of all other modules in the I/O chassis to prevent overloading the chassis backplane and/or backplane power supply. ATTENTION Do not insert or remove modules from the I/O chassis while system power is applied. Failure to observe this rule could result in: • module damage or degradation of performance • injury or equipment damage due to possible unexpected operation. Key the Backplane Connector ATTENTION Place your module in any slot in the chassis except the leftmost slot which is reserved for processors or adapters. Observe the following precautions when inserting or removing keys: • insert or remove keys with your fingers • make sure that key placement is correct Incorrect keying or the use of a tool can result in damage to the backplane connector and possible system faults. Position the keying bands in the backplane connectors to correspond to the key slots on the module. Place the keying bands: – between 4 and 6 – between 10 and 12 I/O chassis Upper Connector You can change the position of these bands if subsequent system design and rewiring makes insertion of a different type of module necessary. Install the Field Wiring Arm ATTENTION Remove power from the 1771 I/O chassis backplane and field wiring arm before removing or installing the I/O module. Failure to remove power from the backplane or wiring arm could cause: • module damage, degradation of performance, or injury. • injury or equipment damage due to possible unexpected operation. Publication 1771-IN082A-EN-P - February 2005 AC (24V) Input Module 1 5 Place the module in the card guides on the top and bottom of the chassis that guide the module into position. Important: Apply firm even pressure on the module to seat it into its backplane connector . 1771-A1B, -A2B, -A3B, -A4B I/O chassis 1771-A1B, -A2B, -A4B Series B I/O chassis Snap the chassis latch over the top of the module to secure it. 2 Swing the chassis locking bar down into place to secure the modules. Make sure the locking pins engage. Attach the wiring arm (1771-WA) to the horizontal bar at the bottom of the I/O chassis. The wiring arm pivots upward and connects with the module so you can install or remove the module without disconnecting the wires. 1771-WA The 1771-IN module is a modular component of the 1771 I/O system requiring a properly installed system chassis. Refer to publication 1771-IN075 for detailed information on acceptable chassis, proper installation, and grounding requirements. Limit the maximum adjacent slot power dissipation to 10W maximum. Connect Wiring to the Field Wiring Arm Make wiring connections to the module through the 10 terminal field wiring arm (cat. no. 1771-WA). The arm pivots on the I/O chassis to connect with terminals on the front of the module and acts as a terminal strip. The wiring arm allows the module to be removed from the chassis without disconnecting the wiring. Publication 1771-IN082A-EN-P - February 2005 6 AC (24V) Input Module ATTENTION Remove power from the 1771 I/O chassis backplane and field wiring arm before removing or installing the I/O module. • Failure to remove power from the backplane or wiring arm could cause module damage, degradation of performance, or injury. • Failure to remove power from the backplane could cause injury or equipment damage due to possible unexpected operation. 1. Make certain all power is removed from the module before making wiring connections. 2. Swing the wiring arm up into position on the front of the module. The locking tab on the module will secure it into place. IMPORTANT The field wiring arm terminal identification number is not the same as the number of the bit which controls that output Not used A Input 0 O Input 1 1 Input 2 2 Input 3 3 Input 4 4 Input 5 5 Input 6 6 Input 7 7 L2 B L1 24V AC High L2 AC Low 1902-I (Actual wiring runs in this direction.) 1 3. Connect one terminal of your 2-wire input device to terminals 0 thru 7. Use stranded 14 or 16 AWG (2.0-1.5mm2) to minimize the voltage drop over long cable distances. Publication 1771-IN082A-EN-P - February 2005 AC (24V) Input Module 7 4. Connect terminal B to the L2 (low) ac return. Terminal A is not used. Use stranded 14 or 16 AWG (2.0-1.5mm2) to minimize the voltage drop over long cable distances . You can use an ac (24V) output module (cat. no. 1771-ON) to directly drive terminals on an ac (24V) input module (cat. no. 1771-IN), but you must connect a 250Ω, 5W resistor between the output terminal and L2 (common) as shown in the following figure. Use the same ac power source to power both modules to ensure proper phasing and prevent module damage. ATTENTION AC (24V) Input Module (Cat. No. 1771-IN) AC (24V) Output Module (Cat. No. 1771-ON) L1 L1 A AC High O O 1 1 2 2 3 3 4 4 5 Typically 250 ohm 5 Watt Resistor 6 7 L2 5 6 7 8 8 L2 AC Low Interpret the Status Indicators A 11903-I The front panel of your module contains 8 red status indicators (below). The red status indicators are on when the associated output is on. Not used Output 0 Output 1 Output 2 Output 3 Output 4 Output 5 Output 6 Output 7 Status Indicators 11067-I Publication 1771-IN082A-EN-P - February 2005 Specifications Specifications ac (24V) Input Module (cat. no. 1771-IN) Number of Inputs Module Location Nominal Input Voltage Nominal Input Current 8 1771-I/O Chassis, 1 slot 24V ac @ 47-63Hz 7mA @ 12V ac 18mA @ 24V ac 22mA @ 28V ac 12V ac to 28V ac 10.5V ac peak 2.8mA ac peak 18ms (+10ms), on or off for ac Onstate Voltage Range Maximum Offstate Voltage Maximum Offstate Current Input Signal Delay1 Isolation Voltage Backplane Current Power Dissipation Thermal Dissipation Environmental Conditions Operating Temperature Storage Temperature Relative Humidity Vibration Enclosure Type Rating ConductorsWire Size Category2 Field Wiring Arm Field Wiring Arm Screw Torque Keying Certifications (when product is marked) Tested at 1500V dc for 60s between user and system No isolation between individual channels 80mA @ 5V dc 5.4W maximum, 0.4W minimum 18.5 BTU/hr maximum, 1.4 BTU/hr minimum 0 to 60°C (32 to 140°F) –40 to 85°C (–40 to 185°F) 5 to 95% noncondensing 2g @ 10-500Hz None (open-style) 14 to 22AWG (2.0 to 0.34mm2) stranded copper wire rated at 75°C or higher 3/64 inch (1.2mm) insulation maximum 2 Catalog Number 1771-WA 7-9 pound-inches (0.8-1.0Nm) between 4 and 6 between 10 and 12 UL UL Listed Industrial Control Equipment CSA CSA Certified Process Control Equipment 1 Input off-to-on filter time is the time from a valid input signal to recognition by the module. Input on-to-off filter time is time from the input signal dropping below the valid level to recognition by the module. 2 You use this category information for planning conductor routing as described in Allen-Bradley publication 1770-4.1, Industrial Automation Wiring and Grounding Guidelines. Publication 1771-IN082A-EN-P - February 2005 8 Supersedes Publication 1771-2.41 - June 1990 PN 957899-72 Copyright © 2005 Rockwell Automation, Inc. All rights reserved. Printed in the U.S.A.