16 Channel TTL to 24V Level Conversion

Characteristics

• 16 channel TTL to 24V conversion
• Integrated High-Side power switches
• In- and outputs electrically isolated
• Suited to drive inductive load
• High current: 1A per channel, 4A per card
• Short circuit proof
• High temperature shut down
• LED switching status for every channel
• LED fault status
• 3U 4HP 19" euro card

Application

This board is intended to convert 5V TTL signals to industry standard 24V level. The high power outputs are suited to drive magnetic contactors, solenoids, and small motors directly.

Figure 1: Typical Application - A block diagram shows a 5V DC control voltage input connected to a "TTL -> 24V Conversion" block, which then outputs to a "Load".

Description

The TTL inputs are connected to internal HCT gates. To ensure proper input levels with open inputs, pull-down resistors are included. Inputs and outputs are electrically isolated via photo couplers. 24V outputs are integrated high-side power switches, capable of driving 1A per channel. Outputs are capable of driving resistive and inductive loads directly. No freewheel diode is required. However, to minimize electromagnetic interference, freewheel diodes near the load could be useful. Outputs are protected against short circuit and excessive temperatures. To achieve higher output current, several outputs of the same group could be paralleled. Grouping is as follows:

• Group 1: Channel 1 - 4
• Group 2: Channel 5 - 8
• Group 3: Channel 9 - 12
• Group 4: Channel 13 – 16

Front Panel

16 indicator LEDs are located on the front panel, signaling the status of the 24V outputs. 4 more LEDs signal group failures.

Figure 2: Front panel - Lists 16 channel status LEDs and 4 error LEDs labeled "Error 1-4", "Error 5-8", "Error 9-12", and "Error 3-16".

Pin Assignment VG Connector

Table 1: Pin Assignment

Sample Circuit

Figure 3: Sample Circuit - Illustrates connections for TTL outputs (Out 1, Out 2, Out 3) and GND to the Level Converter's input pins (e.g., 1A, 1C, 2A, 2C, 9A). The converter's output pins (e.g., 13A, 13C, 14A, 14C, 15A, 15C, 16A, 16C) are shown connected to various 24V loads: a 24V Lamp, a 24V Contactor/Solenoid, and a 24V Motor. An external 24V DC Power Supply provides +24V and GND 24V to the module. An example of a parallel connection for the motor is also depicted.

Technical Data

Table 2: Technical Data

Ordering Details

The Order Number is: TE0101-00

History

Table 3: History