Configure Communications Between Controller and I/O Module
Several parameters control the communication between the controller and the I/O module.
The I/O module hardware has two LEDs. The red LED blinks when the I/O module transmits a message.
The green LED blinks when the I/O module receives a message. Both LEDs may appear to be constantly
on, because message transmissions repeat frequently.
If communication is lost, the I/O module green LED blinks at a slow and constant rate.
Variable Addressing Mode
Variable addressing mode is the default addressing mode of the I/O module, but it is not the default
mode for the function block.
When the device is powered, the CAN shield input voltage is measured. Communication parameters are
determined from the
I/O Module CAN Message Identifiers
table. For proper communication between the
function block and the I/O module, the corresponding N1 value from the table must be entered in the
function block and AddrMode must be set to 0.
Every time the device is powered, the CAN shield input voltage must be within the same N1 range for the
function block and device to reach the Configured status. After the device is powered, the CAN shield
input voltage has no effect on communication.
Predefined Addressing Mode
Predefined addressing mode is the default addressing mode for the function block, but it is not the
default mode for the I/O module.
In this mode, the I/O module reads the N1 value stored in non-volatile memory (EEPROM).
Because the function block and the I/O module use different default addressing modes, as long as the N1
value determined in the I/O module matches the N1 value set in the function block, the device is
configured using predefined addressing mode during all subsequent power cycles. As such, the proper
CAN shield voltage is only required during the first device initialization.
If setting the CAN shield voltage is not practical, use the PLUS+1
®
Service Tool to set the AddrMode to 1
and to set the required N1 value.
User Manual
PLUS+1® Compliant OX024-x10 Function Block
OX024-x10 Function Block
10 |
©
Danfoss | July 2018
11063395 | AQ00000104en-US0101
