Two Channel TTL to 24V & 24V to TTL Converters
Calex Mfg. Co., Inc. of Concord, California announces the availability of
the Models 8501 and 8502. Each Model contains two independent channels which
accept a TTL or 24V pulse signal and convert that signal to a 24V pulse or
TTL output. The 8501 or 8502 is extremely useful where only one signal type
is available, ie. a 24V DC to 5kHz signal, and the receiving device requires
a 5V TTL input. An example would be the direction and step control of a Stepper
Motor by Programmable Logic Controller 24 Volt high speed outputs where the
motor controller requires 5 Volt logic signal levels.
The Model 8501 is a two channel 5V to 24V converter. The two independent channels
require 7mA into 382 ohms to provide a 7mA output into the 3K, 24 Volt typical
PLC logic input. They may be driven by standard TTL logic, H series TTL logic
or with an open collector NPN transistor. Note that low power TTL logic will
not drive this unit. The output is a floating optocoupler NPN transistor which
may be connected in either source or sink configurations. The input frequency
for the 8501 is DC to 15KHz.
The Model 8502 is a two channel 24V to 5V converter. Each channel requires
7mA into 2.5K ohms to provide a 5mA sinking output to TTL 5 Volt logic. The
output is an optocoupler NPN transistor collector and requires the 5 Volt
logic supply and its return. The input frequency range is DC to 20KHz. The
inputs are isolated by optocouplers and are protected from ESD by varistors.
The two outputs have a common emmiter with each output collector capable of
sinking a minimum of 5mA.
The 8501 and 8502 are housed in a DIN Rail mount enclosure which measures
1.65"H x 1.06"W x 3.78"L. Both models are UL 508 and 1604 recognized.
All Calex Signal Conditioning products are backed by Calex’s five year
warranty.
Complete Datasheet:
Models 8501, 8502 Two Channel TTL/24V & 24V TTL Converters