User manual

www.advantech.com/products
Online Download
Features
PCLD-788 16-ch Relay Multiplexer Board
Specifications
I/O
 Channel Closed Signal TTL-level pulse
 Cold-junction Sensor 24.4 mV/°C, 0 V at 0°C
Output
 Contact Rating Break-before-make with 3 msec. minimum break time
 Contact Resistance 200 m: max.
 Input Channels 16 isolated differential inputs
 Programming 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.
General
 Connectors
Controller: 2 x 20-pin box header, second connector in parallel for
daisy chaining
I/O: Screw terminals
 Dimensions (L x W) 205 x 114 mm (8" x 4.5")
 Mounting 4 x screw holes for flat surface mounting
 Power Consumption 5 V @ 380 mA max.
PCLD-788 Block Diagram
 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 circuitr
y for thermocouple measurement
Pin Assignments
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.
Ordering Information
 PCLD-788 16-ch Relay MUX Board w/ Two 20-pin Flat Cables
 PCL-10120-1E 20-pin Flat Cable, 1 m
 PCL-10120-2E 20-pin Flat Cable, 2 m
20-13
DAQ Boards
19
Signal Conditioning
20
Industrial USB I/O
Modules
21