DESCRIPTION
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. Signal switching is done with reed relays making the Minimux® ideal for switching thermocouples, RTDs, control loops, and AC & DC signals.
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
10 W
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 kilohms 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 kilohms, 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 fail-safe 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
Custom printed free of charge. Area available per message is 1.25" x .22" (32 mm x 6 mm); user may specify any size and length that will fit in this area. One line of 14 characters at 9 point type will fit.
CONNECTIONS
Removable screw terminal connectors provided.
OPERATING TEMPERATURE
-10°C to 65°C
POWER
115 or 230 VAC (field select), ± 10%, 50/60 Hz, 4 VA; 24 VDC, ± 10%, 4 watts.
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.
WARRANTY
One year parts and labor.
EXTENDED WARRANTY
Warranty may be extended for an additional 12 months by returning the Product Registration Form within 2 months from date of purchase.
ORDERING INFORMATION
