BECKHOFF M2400 User Manual
M2400 Analog Output Beckhoff I/O-System
M2400 Analog Output
Technical Description
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Date : 11.06.2002 Version : 2.1 Page 1 of 1
M2400 Analog Output Beckhoff I/O-System
Table of Contents
1. Function Description Hardware ....................................................3
2. Function Description Software ......................................................5
3. Technical Data.................................................................................6
4. Installation .......................................................................................7
5. Table of Connections ....................................................................12
page 2 of 2 Version : 2.1 Date : 11.06.2002
M2400 Analog Output Beckhoff I/O-System
1. Function Description Hardware
M2400
About the Hardware
The parallel module M2400 is an input / output module used in the II/O system. There are 16
standard 24 V inputs / outputs, which achieve 2 ports of 8 bit each, and four analog output
channels.
Each input / output has an LED, that indicates the current state. Furthermore there are three
LED's installed used for diagnosis of the II/O fibre optical ring:
LD1 The green 'CYCLE' LED is switched on by each start bit of a telegram and is
switched off again by the stop bit.
LD2
LD3
In case an error is detected, all outputs are reset.
The red 'ERROR' LED is switched on after recognition of bad telegram (checksum,
frame). After a sequence of three correct telegrams (checksum, frame) were processed it
is switched off again.
The green LED 'WATCHDOG' is switched on by a valid writing telegram with matching
address. If no telegram with the properties defined above is recognised for the next
100 ms a special unit of the module switches off all outputs.
Date : 11.06.2002 Version : 2.1 Page 3 of 3
M2400 Analog Output Beckhoff I/O-System
Basic Circuit Diagram
page 4 of 4 Version : 2.1 Date : 11.06.2002
M2400 Analog Output Beckhoff I/O-System
2. Function Description Software
The four ports D0..D3 correspond to the data bytes in the FO transmission protocol.
Analog Output
Through the analog channels 1 to 4 of the M2400 analog values of 12 bit resolution are
transmitted in a voltage range of - 10V .. + 10V. The selection of a certain DAC is done by a
logic "0" one of the most significant 4 bits of port D1.
The transmission of the 12 bit data word is done by the least significant four bits of port D1
and the eight bits of port D0.
SELECT PORT D1
MSB LSB
DAC 1
DAC 2
DAC 3
DAC 4
0 1 1 1 DDDD DDDD DDDD
1 0 1 1 DDDD DDDD DDDD
1 1 0 1 DDDD DDDD DDDD
1 1 1 0 DDDD DDDD DDDD
4 bit
select
low-active
PORT D0
MSB LSB
12 bit data
OUTPUT PORT D1
MSB LSB
+10V
0V
SSSS 0 0 0 0 0 0 0 0 0 0 0 0
SSSS 1 0 0 0 0 0 0 0 0 0 0 0
PORT D0
MSB LSB
-10V
SSSS 1 1 1 1 1 1 1 1 1 1 1 1
4 bit
select
low-active
12 bit data
Date : 11.06.2002 Version : 2.1 Page 5 of 5
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