PCLD-788
Features
16-ch Relay Multiplexer Board
16 to 1 channel expansion
Differential and fully isolated multiplexing
Break-before-make relay control
“Channel closed” signal for precise A/D triggering
Up to 16 PCLD-788s can be cascaded for 256 channels
Easy wiring for large channel count configuration
Onboard cold-junction circuitry for thermocouple measurement
Introduction
PCLD-788 multiplexes 16 channels into a single I/O channel of an A/D converter, voltmeter or IEEE-488-based instrument. Up to 16 PCLD-788s can be cascaded for a total of 256
fully-isolated differential channels. The PCLD-788 can be controlled by any PC-LabCard™ product via a 16-bit 20-pin digital output port, found on cards such as the PCL-711B,
PCL-812PG or the PCL-818 series. Channel selection (0-15) and board selection (0-15) are done by programming the high-order four bits and low order four bits of a digital output
byte from the main I/O card in use.
Specifications
I/O
Channel Closed Signal
Cold-junction Sensor
Output
Contact Rating
Contact Resistance
Input Channels
Programming
TTL-level pulse
+24.4 mV/° C, 0 V at 0° C
Break-before-make with 3 msec. minimum break time
200 mΩ max.
16 isolated differential inputs
DO bit 0, 1, 2 and 3 for channel selection, DO bit 4, 5,
6 and 7 for board selection. Onboard DIP switches for
board-address setting
Max. Input Voltage
100 V
DC
or 100 V peak AC
Max. Switching Current
0.5 A
Max. Switching Power
10 VA
Operating Time
1 ms max.
Relay Life Expectancy
100 million cycles min. at 10 V
DC
and 1 mA
Release Time
1 msec. max.
PCLD-788 Block Diagram
Pin Assignments
General
Certifications
Connectors
Controller:
I/O:
Dimensions (L x W)
Mounting
Power Consumption
CE
2 x 20-pin box header, second connector in parallel for
daisy chaining
Screw terminals
205 x 114 mm (8" x 4.5")
4 x screw holes for flat surface mounting
+5 V @ 380 mA max.
Ordering Information
PCLD-788
PCL-10120-1
PCL-10120-2
16-ch Relay MUX Board w/ Two 20-pin Flat Cables
20-pin Flat Cable, 1 m
20-pin Flat Cable, 2 m
Online Download
www.advantech.com/products
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