I/O-Modules
Fox Series
MDM-8, Digital Power Output Sub-module

 
 
Product Description

The MDM-8 output module is a submodule, which is galvanically decoupled by means of optocouplers, for the CNX21 base module. The submodule provides eight digital outputs for 24V/2.2A. For the operation in the II/O system, you can install up to four MDM-8’s  in the four slots of a CNX21 base module. This makes possible a maximum of 32 outputs per CNX21. In addition, you can combine MDM-8’s with different modules, e.g. digital inputs. 

The outputs are short-circuit-proof and protected against thermal overload. For inductive loads, the outputs are protected by an avalanche diode rated at 72V/5A/100mJ. Due to the high avalanche voltage, the break-time of an inductive load is very low (typically less than 30 ms). 

The module has one error output each for channels 0-3 and 4-8. The master can read back these error outputs via an MDI-8, for example. The error outputs are activated in the case of an output short-circuit or of a defect in the output driver.. To save input channels, you can connect both error outputs to one common MDI-8 channel.

Technical data

 MDM-8

Outputs

 8 switching outputs, galvanically decoupled
2 error outputs
8 LED output status indicators
2 LED error indicators
1 LED voltage indicator

Output Specifications

 24V / 2.2A   (*1), short-circuit proof, thermally protected
suitable for inductive loads (*2), RDSon = 100 mOhm

Output Monitoring

 Watchdog Circuit
2 error outputs, 24V / 10mA, short-circuit-proof

Supply Voltage

 24 VDC  (± 20%)
Current Consumption System voltage:    20 mA
Switching voltage: 80 mA (without load currents)

Housing

 Module with front panel is mounted in the CNX21 using two screws

Dimensions (WxHxD)

 58 * 72 * 50 mm

Weight approx.

 200 g

Operating temperature

 0°C ... +55°C

Storage temperature

 -20°C ... +70°C
 

Signal Description

Pin  

 Signal I/O Description
L-1 F 0-3 Out

Error output for channels 0-3
L-2 F 4-7 Out

Error output for channels 4-7
L-3 DO 0 Out

Bit 0 of data byte 0, 1, 2 or 3  

L-4 DO 1 Out Bit 1 of data byte 0, 1, 2 or 3
L-5 DO 2 Out Bit 2 of data byte 0, 1, 2 or 3
L-6 DO 3 Out Bit 3 of data byte 0, 1, 2 or 3
L-7 DO 4 Out Bit 4 of data byte 0, 1, 2 or 3
L-8 DO 5 Out Bit 5 of data byte 0, 1, 2 or 3
L-9 DO 6 Out Bit 6 of data byte 0, 1, 2 or 3
L-10 DO 7 Out Bit 7 of data byte 0, 1, 2 or 3
 
M-1, 2  24V VCC

+ 24 VDC  logic supply for output stage

M-3, 4  24V.1 VCC + 24 VDC supply of outputs bit 0 and bit 1
M-5, 6  24V.2 VCC + 24 VDC supply of outputs bit 2 and bit 3
M-7, 8  24V.3 VCC + 24 VDC supply of outputs bit 4 and bit 5
M-9, 10  24V.4 VCC + 24 VDC supply of outputs bit 6 and bit 7
 
R-i 0V GND ground, feedback of outputs
i = 1 to 10

Pin designations: L = left-hand row      R = right-hand row      M = middle-hand row

 

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Copyright © 2000 TRS Fieldbus Systems, Inc. All rights reserved.
Revised: August 07, 2000 .