Related Manuals for Omega DRA-CSM-1
Summary of Contents for Omega DRA-CSM-1
- Page 1 User’s Guide http://www.omega.com e-mail: info@omega.com DRA-CSM-1 CURRENT MULTIPLEXER...
- Page 2 Toll Free in England: 0800-488-488 e-mail: uk@omega.com It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is constantly pursuing certification of its products to the European New Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.
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Page 3: Table Of Contents
Contents 1. GENERAL DESCRIPTION 2. MOUNTING INSTRUCTIONS 3. REPLACING FUSES 4. ASSEMBLY 5. SUPPLY VOLTAGE 6. CONNECTING TRANSMITTERS TO THE MULTIPLEXER 6.1 Two-Wire Transmitter 6.2 Three-Wire Transmitter 6.3 Four-Wire Transmitter 7. CONTROL 7.1 Enable/Test 7.2 Address 7.3 Address Polarity 7.4 Control Tables 7.4.1 True Low Setting 7.4.2 True High Setting 8. -
Page 4: General Description
1.GENERAL DESCRIPTION The DRA-CSM-1 is a multiplexer for 16 analog 4-20mA current loops. The transmitter/transducer currents are input via "I" terminals. Each input is protected by a 63mA fuse. The current input is steered either to the output ("lo") terminal or to the negative (COM) terminal of the power supply (PWR). -
Page 5: Assembly
Note: The terminal strips are polarized and must not be placed backwards. 5. POWER SUPPLY The DRA-CSM-1 is supplied by a regulated power supply at a range of 15 to 40Vdc. This voltage is used to feed the connected transmitters via the multiplexer's "V"... -
Page 6: Connecting Transmitters To The Multiplexer
"+V" is connected to the multiplexer "V" terminal, its negative terminal "-V" is connected to the multiplexer's "COM" terminal and the current output terminal "Io" is connected to the DRA-CSM-1 "I" terminal. (see fig 3). Figure 3. -
Page 7: Four-Wire Transmitter
The unit is enabled when "E/T" is in logical "0" (low) state. In a disabled state, the DRA-CSM-1 outputs no current and reflects a Hi-Z state. The disabled state of the DRA-CSM-1 multiplexer is used to check the functioning of all the current inputs. This is performed by simultaneously injecting current pulses to all 16 channels which cause the functioning channels to flash. -
Page 8: Address Polarity
"1111" selects channel #1. Moving the jumper to the second alternative, reverses the logic. Figure 6. Note: If the PLC and the DRA-CSM-1 are powered by separate power supplies, then the negative terminals should be connected. 7.4 CONTROL TABLES 7.4.1 "True Low" Setting... -
Page 9: Multi-Drop Configuration
In the disabled state (E=1), the multiplexer outputs no current and exhibits a high Z state. This mode allows the connection of several DRA-CSM-1 units to one PLC's analog input, by tying their output terminals and the address lines in parallel, and applying individual Enable lines to select the desired multiplexer by disabling all but one. -
Page 10: Specifications
9. SPECIFICATIONS INPUTS ANALOG INPUTS (Reverse Polarity Protected) 16, 0/4-20mA Current loop Max Input Current 30mA CONTROL INPUTS 4 Address inputs E/T Enable/Test input Logic Levels Low: "0" < 0.4V High: 5 < "1" < 60V Logic Polarity Selectable - True High/True Low OUTPUTS CURRENT OUTPUT 4-20mA, Current Loop... - Page 11 OMEGA harmless from any liability or d a m a g e w h a t s o e v e r a r i s i n g o u t o f t h e u s...
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