12.11 Installation → MODBUS client I/O Setup
Signal value
Here, the current value of the signal is shown. For register signals, the value is ex-
pressed as an unsigned integer. For output signals, the desired signal value can be set
using the button. Again, for a register output, the value to write to the unit must be
supplied as an unsigned integer.
Signal connectivity status
This icon shows whether the signal can be properly read/written (green), or if the unit
responds unexpected or is not reachable (gray). If a MODBUS exception response is
received, the response code is displayed. The MODBUS-TCP Exception responses are:
• E1 ILLEGAL FUNCTION (0x01): The function code received in the query is not
an allowable action for the server (or slave).
• E2 ILLEGAL DATA ADDRESS (0x02): The function code received in the query
is not an allowable action for the server (or slave), check that the entered signal
address corresponds to the setup of the remote MODBUS server.
• E3 ILLEGAL DATA VALUE (0x03): A value contained in the query data field is
not an allowable value for server (or slave), check that the enterd signal value is
valid for the specified address on the remote MODBUS server.
• E4 SLAVE DEVICE FAILURE (0x04): An unrecoverable error occurred while the
server (or slave) was attempting to perform the requested action.
• E5 ACKNOWLEDGE (0x05): Specialized use in conjunction with programming
commands sent to the remote MODBUS unit.
• E6 SLAVE DEVICE BUSY (0x06): Specialized use in conjunction with program-
ming commands sent to the remote MODBUS unit, the slave (server) is not able
to respond now.
Show Advanced Options
This check box shows/hides the advanced options for each signal.
Advanced Options
• Update Frequency: This menu can be used to change the update frequency of
the signal. This means the frequency with which requests are sent to the remote
MODBUS unit for either reading or writing the signal value.
• Slave Address: This text field can be used to set a specific slave address for the
requests corresponding to a specific signal. The value must be in the range 0-255
both included, and the default is 255. If you change this value, it is recommended
to consult the manual of the remote MODBUS device to verify its functionality
when changing slave address.
CB3 II-32 Version 3.1 (rev. 17782)
Copyright © 2009-2015 by Universal Robots A/S. All rights reserved.
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