AB 1771-NIV Rockwell digital input module is new and available
Technical data of product parameters
Coils and contacts are 1771-NIV addressed at the bit level. Coils are outputs and
can be read and written. Contacts are inputs and are read-only.
Input registers and holding registers are addressed at the word level.
Input registers are generally used for internally storing input values.
They are read-only. Holding registers are general purpose and can be
both read and written.
The most significant digit of the address is considered a prefix, and does
not get entered into the MB Data Address field when configuring the
message instruction. 1771-NIV
When the message is sent, the address is decremented by 1 and
converted into a 4-character hex number to be transmitted via the
network (with a range of 0-FFFFh); the slave increments the address by
1, and selects the appropriate memory group based on the Modbus
function.This section describes how to configure a local message using the Modbus 1771-NIV
communication commands. Since configuration options are dependent on
which channel is selected, the programming software has been designed to
only show the options available for the selected channel.
Before configuring the MSG instruction, open the Channel Configuration
screen and set the Driver to Modbus RTU Master. For more information on
Channel Configuration, see Configuring a Channel for Modbus RTU Master
on pageTo message to an Ethernet Network Interface (ENI) or MicroLogix 1100,
enter the target device’s IP address in the first row ‘To Address’ field.
To message to a CompactLogix, ControlLogix, or FlexLogix controller, enter
the controller’s Ethernet interface IP address in the first row ‘To Address’
field, press the keyboard insert key to add a hop (which appends a second row 1771-NIV
labeled ControlLogix Backplane) and enter the controller’s backplane slot
number (0 to 16 for ControlLogix, always 0 for CompactLogix and FlexLogix)
in the second row ‘To Address’ field.
To message through a ControlLogix gateway to ControlNet, DH+, or
DH-485, enter the slot number of the desired network interface module in the
second row ‘To Address’ field, press the keyboard insert key to add another
hop (which appends a third row), select the appropriate ‘From Device’ and
‘From Port’ (if applicable) and enter the node address in ‘To Address’ field.
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