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Summary of Contents for Leviton A8332
- Page 1 Modbus Flex I/O Module Cat. No. A8332 Installation and Operation Manual DI-004-A8332-00A...
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Page 2: Table Of Contents
TABLE OF CONTENTS 1 Product Application Limitation ................3 2 Features and Specifications ................4 3 Installation Checklist .....................5 3.1 Required Components ..................5 3.2 Configuration Software Required ...............5 4 Hardware Installation ....................6 5 Dip Switch Configuration ..................8 6 Operation ........................9 7 Troubleshooting ....................10 8 Modbus Registers ....................12 8.1 Modbus Functions ...................12 8.2 Modbus Register Listing ..................15... -
Page 3: Product Application Limitation
PRODUCT APPLICATION LIMITATION • Leviton products are not intended for use in critical applications such as nuclear facilities, human implantable devices or life support. Leviton is not liable, in whole or in part, for any claims or damages arising from such uses. -
Page 4: Features And Specifications
2 FEATURES AND SPECIFICATIONS The A8332 is designed to read a variety of industry standard analog and pulse sensor devices and communicate the data values back to a Modbus master system using RS485. Applications include data acquisition systems reading gas/water/ electric meters or analog sensors such as temperature, humidity, pressure, and flow. -
Page 5: Installation Checklist
3.2.3 Third party software or hardware/PLC. If neither the LCC software or EMB Hub are available, all features in the A8332 may be configured by writing Modbus register values to the device. Use a software tool such as ModScan32 or SimplyModbus to write to the registers. Also, many hardware data loggers or PLC systems can write to Modbus registers as well. -
Page 6: Hardware Installation
4.1.2 Attach the power supply to the input terminals on the A8332 module. 4.1.3 Attach the RS485 +, - and shield wires to the A8332 module. Attach the other end of the RS485 line to the Modbus master device, such as an EMB Hub. Be careful to observe polarity on both ends of the RS485 connection. - Page 7 2 minutes at the Modbus address set in step 4.1.4. Click on the device and select “Configure” to give the A8332 a logical name. This will allow the EMB Hub to begin logging data for the device. If you are using the Leviton Configuration Console, enter the Modbus address from step 4.1.4 in the scan range field and click...
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Page 8: Dip Switch Configuration
5 DIP SWITCH CONFIGURATION Modbus Address: Before the A8332 can be used, you must set the Modbus address of the A8332. This address must be unique among all Modbus devices in the system. The A8332 supports address 1 through 127. -
Page 9: Operation
Also, you will need to configure each pulse input with a Name, Engineering Unit, and Multiplier. Using the Obvius Config Console software, select the A8332 from the list, and choose the input mode from the dropdown list. Be sure to click the “Save” button at the bottom of the page. -
Page 10: Troubleshooting
If the LED is always on, you may have a short in the wires leading to the pulse output meter. Try removing the wires from the A8332 input to confirm the LED turns off. If so, repeat the test with the wires attached at the A8332, and disconnected at the pulse output meter. - Page 11 Verify the analog output sensor is connected to the proper terminals. For a self-powered 2 wire 0-10V sensor, this is typically the GND and IN# terminals of the A8332. For a 3-wire device that uses power supplied by the A8332, all three input wires (GND, IN# and +24V) will be used.
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Page 12: Modbus Registers
8 MODBUS REGISTERS 8.1 Modbus Functions 8.1.1 Modbus Functions: The A8332 responds to the following Modbus/RTU functions: • function 0x11 Report slave ID. • function 0x03 read holding registers (multiple) • function 0x06 preset single register All Modbus registers are read-only unless otherwise noted. Registers listed as “NV” are options that are stored in non-volatile memory and will be preserved when power is removed from the device. - Page 13 The fields for inst/min/max will be valid after only one pulse value is received. * Average rate: (not an A8332 datapoint) The EMB Hub will compute an average rate for the pulse count input. The calculation will be performed at the end of each logging cycle by subtracting the count at the start and end of the interval and dividing by the interval length.
- Page 14 8 MODBUS REGISTERS 8.1.6 Voltage Mode, Current Mode, Resistance Mode: (all 3 modes are the same unless otherwise noted) Instantaneous: The instantaneous reading will report the present status of the input, represented in ohms, mA, or volts. The value uses a short-term average of the last 16 A/D converter readings to compute the value of this register.
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Page 15: Modbus Register Listing
8 MODBUS REGISTERS 8.2 Modbus Register Listing... - Page 16 8 MODBUS REGISTERS...
- Page 17 All 32 bit data point values are encoded in 2 Modbus registers (16 bits each). Modbus master systems should always query the A8332 using a single query to read an entire block of registers. Never use two queries to read one register and then combine the two results into a single 32 bit value. Doing so will allow the pulse count to increment in the middle of the two Modbus queries, and will cause intermittent data readings that are incorrect.
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Page 18: Mechanical Drawings
9 MECHANICAL DRAWINGS DIN-Rail (EN50022) mount package: Width 105mm (6 DIN modules) 3.39in 86mm... -
Page 19: Warranty And Contact Information
LIMITED 2 YEAR WARRANTY AND EXCLUSIONS Leviton warrants to the original consumer purchaser and not for the benefit of anyone else that this product at the time of its sale by Leviton is free of defects in materials and workmanship under normal and proper use for two years from the purchase date. Leviton’s only obligation is to correct such defects by repair or replacement, at its option. - Page 20 DI-004-A8332-00A...
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