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13.11 Installation
MODBUS client I/O Setup
signal frequency can be observed in signal statistics (see section 13.11). The signal indicator
will turn yellow if the actual signal frequency is less than half of the value selected from the
"Frequency" drop-down list.
Add signal
Push this button to add a signal to the corresponding MODBUS unit.
Delete signal
Push this button to delete a MODBUS signal from the corresponding MODBUS unit.
Set signal type
Use this drop down menu to choose the signal type. Available types are:
Digital input: A digital input (coil) is a one-bit quantity which is read from the MODBUS unit
on the coil specified in the address field of the signal. Function code 0x02 (Read Discrete
Inputs) is used.
Digital output: A digital output (coil) is a one-bit quantity which can be set to either high or low.
Before the value of this output has been set by the user, the value is read from the remote
MODBUS unit. This means that function code 0x01 (Read Coils) is used. When the output
has been set by a robot program or by pressing the set signal value button, the function
code 0x05 (Write Single Coil) is used onwards.
Register input: A register input is a 16-bit quantity read from the address specified in the address
field. The function code 0x04 (Read Input Registers) is used.
Register output: A register output is a 16-bit quantity which can be set by the user. Before the
value of the register has been set, the value of it is read from the remote MODBUS unit.
This means that function code 0x03 (Read Holding Registers) is used. When the output has
been set by a robot program or by specifying a signal value in the set signal value field,
function code 0x06 (Write Single Register) is used to set the value on the remote MODBUS
unit.
Set signal address
This field shows the address on the remote MODBUS server. Use the on-screen keypad to
choose a different address. Valid addresses depends on the manufacturer and configuration of
the remote MODBUS unit.
Set signal name
Using the on-screen keyboard, the user can give the signal a name. This name is used when the
signal is used in programs.
Signal value
Here, the current value of the signal is shown. For register signals, the value is expressed 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.
Version 3.11
II-49
e-Series
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