66 Commissioning
WAGO-I/O-SYSTEM 750 XTR
750-652/040-000 Serial Interface RS-232/RS-485 XTR
Manual
Version 1.3.0
Malfunctions possible under high load conditions!
If there are a large number of I/O modules in the node or if transmitting via
multiple DMX channels, the refresh rate can drop below 1 update per second.
This can also cause malfunctions in the connected DMX receivers!
In this case, reduce the number of I/O modules or the number of DMX channels.
8.3.6.3 Mode when Receiving DMX Data
With firmware version 06 or higher, the I/O module can receive data for a limited
number of DMX channels according to the set size of the process image (see table
“Process Data in DMX Mode when Receiving DMX Data” and “Number of
Received DMX Channels”).
Switching between Sending and Receiving Modes
You can switch between sending and receiving modes in the CODESYS 2.3 and
e!
COCKPIT
programming tools by calling up the respective module.
Table 47: Process Data in DMX Mode when Receiving DMX Data
Process
image
size
Input data
Output data
24 bytes
S0 Status byte 0
C0 Control byte 0
S1 Status byte 1
C1 Control byte 1
D0 Status/number of channels
D0 Data byte 0
*)
D1 Data byte 1
(start DMX c 1)
D1 Data byte 1
*)
…
…
D21 Data byte 21
(start DMX c 21)
D21 Data byte 21
*)
*)
No relevant for DMX receive.
Table 48: Number of DMX Channels Received
Process image size
Number of received DMX channels
24 bytes
21
The number of DMX channels actually received at the fieldbus master is
transmitted via byte D0 of the input data (see table “DMX Diagnostics – Diagnostic
Bits in Byte D0 of the Input Data”).
The bytes that cannot be assigned to any DMX channel receive the value 0 in the
process data.
