Obvius A8923-4 User Manual

Obvius A8923-4 Installation Instructions

IO Module: Analog 4-20mA/0-10V and Pulse to Modbus

WARNING--REFER INSTALLATION AND SERVICING TO QUALIFIED PERSONNEL ONLY!

● Read instructions throughly prior to install

● This product is not intended for life or safety applications

Applications shown are suggested means of installing this product, but it is the responsibility of the installer to ensure that the
installation is in compliance with all national and local codes. Installation should be attempted only by individuals familiar with
proper installation techniques and with codes, standards, and proper safety procedures for control installations.

Installation, Wiring and Setup

1. Snap unit to existing DIN rail.

2. Connect power supply, network wiring, and sensor inputs as
indicated in wiring diagram.

3. Select network address as indicated by the diagram. Each
modbus device must have a unique address.

4. Auto-detect analog inputs: Make sure all analog devices are
properly installed and powered. Press the “LEARN” button.
Inputs will automatically be identified as 4-20mA or 0-10v.

5. Verify pulse inputs: Contact closure on pulse inputs will cause
red pulse LEDs to blink. Verify each pulse input is functioning
properly.

Modbus Point Map

Address Function Range Address Function Range

40001 Analog 1 Instantaneous reading. 0-4095 40017 Pulse State Register *See Note.

40002 Analog 2 Instantaneous reading. 0-4095 40018 Pulse 1 ontime LSW (seconds)

40003 Analog 3 Instantaneous reading. 0-4095 40019 Pulse 1 ontime MSW (seconds)

40004 Analog 4 Instantaneous reading. 0-4095 40020 Pulse 2 ontime LSW (seconds)

40005 Pulse 1 LSW 40021 Pulse 2 ontime MSW (seconds)

40006 Pulse 1 MSW 40022 Pulse 3 ontime LSW (seconds)

40007 Pulse 2 LSW 40023 Pulse 3 ontime MSW (seconds)

40008 Pulse 2 MSW 40024 Pulse 4 ontime LSW (seconds)

40009 Pulse 3 LSW 40025 Pulse 4 ontime MSW (seconds)

40010 Pulse 3 MSW 40026 Analog 1 min 0-4095

40011 Pulse 4 LSW 40027 Analog 1 average 0-4095

40012 Pulse 4 MSW 40028 Analog 1 max 0-4095

40013 Status Register *See Note. 40029 Analog 2 min 0-4095

40014 Firmware Version (111 = 1.11) 40030 Analog 2 average 0-4095

40015 Uptime Seconds LSW (seconds) 40031 Analog 2 max 0-4095

40016 Uptime Seconds MSW (seconds) 40032 Analog 3 min 0-4095

40033 Analog 3 average 0-4095

40034 Analog 3 max 0-4095

40035 Analog 4 min 0-4095

40036 Analog 4 average 0-4095

40037 Analog 4 max 0-4095

Supported Modbus commands:

0x03 Read Holding Registors
0x06 Preset Single Register
0x11 Report Slave ID
All other Modbus commands return "Illegal Function" . The Status Register is the only register that is read/write.
Device ID = 50
Device name = "Obvius 4A4P-M2"

* Status Register (40013) * Pulse State Register (40017)

Bits 0-3 Analog input type. bit 0 is Analog 1

0=4-20mA, 1=0-10V (read/write)

Bits 4-7 Analog overcurrent/voltage. bit 4 is Analog 1

0=Ok, 1=Alarm (read-only)

Bits 8-11 Analog broken 4-20mA wire. bit 8 is Analog 1

0=Ok, 1=Alarm (read-only)

Bit 12 Debounce feature slows down the pulse scan rate for mechanical relays

0=250Hz Max, 1=20Hz Max (read/write)

Bit 13 1 = resets min/max/average to current value (read/write)

Bit 14 bit is unused. Always 0

Bit 15 1 = set learn mode (read/write)

The Obvius A8923-4 ships from the Factory configured for 0-10V. Press the Learn button if 4-20mA products are used.

When changing a single bit in the status register: First read the register from the IO module, next, set or clear the bit as needed and then write
the register value back to the IO module. Simply writing 0x20 to set the pulse input debounce feature will also force all analog inputs into 4­20mA mode.

Bit 0 Pulse 1 status

0 = contacts open, 1 = contacts closed

Bit 1 Pulse 2 status

0 = contacts open, 1 = contacts closed

Bit 2 Pulse 3 status

0 = contacts open, 1 = contacts closed

Bit 3 Pulse 4 status

0 = contacts open, 1 = contacts closed

bits 4-15 Unused

Troubleshooting

Power LED is not on: Ensure 24VDC is present and polarity is correct.

Data LEDs do not blink: Check network wiring, address selection. Verify master Modbus controller is functioning.

Pulse LEDs do not blink: Verify pulse inputs are dry contact or opto-isolator wired with correct polarity.

Analog values inaccurate: Verify analog devices are wired correctly. Press LEARN button to re-configure.

No output from unit: Check network wiring, address selection. Verify Modbus master device is configured to read correct points.

Verify Modbus master is configured to scale sensor outputs properly.
Check sensor output range. Make sure Modbus master is configured with correct scaling.

Specification

Inputs

Power 24vdc, 50mA, + converter powered analog devices

Analog 4-20mA or 0-10v auto-detected (ranges and units set in master device)

Pulse Dry contact, 250Hz max. (user selectable to 20Hz max)

Accuracy +/- 0.25% F.S. (Analog Input)

Output

Hardware RS-485, 2-wire , non-isolated

Protocol Modbus RTU Protocol, 9600baud

Latency 5mS

Configuration

Address 6-position DIP switch, 63 addresses

Analog Input Auto-detecting 0-10v or 4-20mA (ranges and units set in master device)

General

Dimensions 4-module, 70mm x 86mm x 58mm(h)

Material Base part: Black Noryl UL94-V0; PCB material: FR-4

Mounting Compatible with M36 DIN-RAIL (EN50022)

Operating Environment 0 to 50 degrees C, 0 to 95%RH non-condensing

0-10v Input impedance = 10k ohms
4-20mA Input Impedance = 250 ohms
Scan Rate 250mS (1/4 second)

input impedance 500 ohms max.

3300 NW 211th Terrace, Hillsboro, OR 97124, Ph: [phone] Date: Jun 21, 2010
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