Motion Coordinator Technical Reference Manual
Expansion Modules 5-13
CAN Analog Inputs Module (P325)
Software Interfacing
The Motion Coordinator will automatically detect and allow the use of correctly
connected P325 modules. The number of connected analog input channels is
reported in the startup message and is also available to the programmer via an
additional system parameter “NAIO”.
The analog input resolution is fixed at +10volts to -10volts and will return values
-2047 to 2048 to the function AIN(). The first 4 channels are also available as sys-
tem parameters AIN0, AIN1, AIN2, and AIN3. This allows these values to be seen
using the SCOPE function.
The P325 works “single ended” and does not return differential values.
It is not possible to mix the P325 module which is running the TRIO I/O protocol
with DeviceNet equipment on the same network.
Troubleshooting
If the network configuration is incorrect 2 indications will be seen: The P325
module will indicate that it is uninitialised and the Motion Coordinator will
report the wrong number when questioned:
>>? NAIO
If this is not as expected check:
• Terminating 120 Ohm Network Resistors fitted?
• 24Volt Power to Network?
• DIP switches in sequence starting 16,17,18...?
• System Software Version 1.42 (or higher)?
• Motion Coordinator CANIO_ADDRESS=32?
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