Model PD118

8 Channel Scanner with Built-in Annunciator

The Minimux® is a microprocessor-based eight channel analog input scanner/multiplexer and annunciator that provides low cost automatic switching for multi-point display and alarm systems. Each Minimux® can automatically switch up to eight inputs to another device such as a digital panel meter, controller, or PLC. Multiple units can be connected together to scan an unlimited number of points. Front panel push-buttons allow for easy programming of independent adjustable dwell times as well as rapid channel skipping. External scanning allows an external device such as a PLC or DCS to direct which channel to scan and for how long. The built-in annunciator logic can detect and indicate which input signals are in alarm condition. The built-in horn, alarm relay, and front panel LEDs are sure to catch an operator's attention. Signal switching is done with reed relays making the Minimux® ideal for switching thermocouples, RTDs, control loops, and AC & DC signals.

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Features

• 8 Inputs Per Unit
• Unlimited Number of Units Per System
• Thermocouples, RTDs, Process, AC & DC Inputs
• Internally or Externally Controlled Scanning
• PLC Controllable
• Adjustable Dwell Time for Each Channel
• Independent Alarm Input for Each Channel
• First-out Alarm Indication
• Alarms Indicated by LEDs, Built-in Horn, and Relay
• Stop-On-Alarmed Channel (field select)
• FREE Custom Printed Message Labels, at any time
• Removable Screw Terminal Connectors

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Ordering Information

Model:	Description:
PD118	8 Channel Scanner/Annunciator; 115 or 230 VAC (field select)
PD118-CL	8 Channel Scanner/Annunciator; 115 or 230 (field select) with current loop resistor network installed (for 4-20 mA inputs)
PDA-CL	Current Loop Resistor Network (for 4-20 mA inputs)

Notes:

All units are shipped from the factory set for 115 VAC power.

Message labels for the PD118 may be specified at time of order or later.

Removable screw terminal connectors are standard on the PD118.

There is no special cable required to connect multiple PD118s together.

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Specifications

• NUMBER OF CHANNELS PER MINIMUX: 8 double-pole channels per unit.
  
• NUMBER OF CHANNELS PER SYSTEM: Unlimited
  
• SIGNAL SWITCHING: DPST reed relays
  
• CONTACT RESISTANCE: 0.2 ohms maximum
  
• MAXIMUM INPUT VOLTAGE: 200 V (switched or common mode)
  
• Maximum Current Switched: 0.5 A
  
• Maximum Power Switched: 10W
  
• Dwell Time (Internal-scan): Each channel adjustable from 0.6 to 30 seconds.
  
• Dwell Time (External-scan): Determined by external device such as a PLC or DCS, 1.5 seconds per channel minimum.
  
• Non-volatile Memory: All programming values are stored in non-volatile memory for ten years if power is lost.
  
• Scan Method: Internal or externally controlled (PLC, etc.)
  
• Channel Select/Channel ID: Input Impedance;10 Kohm pull-up to 5 V.
  
  Each channel on the Minimux® has a Channel Select/Channel ID line which is used to either select or
  
  identify a channel on the PD118. For instance, in External Scan Mode, an external device such as a
  
  PLC can drive the Channel Select/Channel ID line low for the channel it wants to see, the PD118 will
  
  then go to that channel. In Internal Scan Mode, the Channel Select/Channel ID line for the currently
  
  scanned channel goes low to provide identification of the current channel to an external device.
  

  Channel Indication: Green LED on front panel; Channel Select/ID line goes low.
  

  Disabling channels: Channels may be disabled during setup with front panel CTRL button.
  

  Scan Stop: The scan may be stopped by pressing and holding the CTRL button for more than 0.5 seconds. The scan may be resumed by pressing and releasing the CTRL button quickly (less than 0.5 seconds).
  

  Alarm Input: Independent alarm input for each channel. Input Impedance; 25 Kohm, typical pull-up to 5V.
  

  Alarm Sequence: Sequence A or Sequence F2A (first out).
  

  Alarm Outputs: Alarm condition indicated by:
  

  • Front panel red LED for each channel.
    
  • Relay, 1 SPDT (form C); rated 2 Amp @ 30 VDC or 2 Amp @ 250 VAC resistive load; 1/14 HP @ 125 / 250 VAC for inductive loads. For failsafe operation, the relay is energized in the non-alarm state. In the case of a power failure, the relay will go to the alarm state,
    (NC contact is connected to common).
    
  • Built-in Horn, 75 dB.
    
  • Stop-on-alarmed-channel (user select).
    

  Alarm Acknowledgment: Front panel ACK and rear connector terminals.
  

  External CTRL function: The functions of the CTRL button are available at screw terminals at the rear of the instrument.
  

  Message Labels: Free, custom printed, 1 line per message at 14 characters per line. Factory or field printable.
  

  Connections: Removable screw terminal connectors provided.
  

  Operating temperature: -10^oC to 65^oC
  

  Power: 115 or 230 VAC (field select), +/-10%, 50/60 Hz, 4VA.
  

  LED Test: All LEDs are tested on power-up.
  

  Enclosure: 1/8 DIN, high impact plastic, UL94V-0.
  

  Front Panel: NEMA 4X, panel gasket provided.

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