User manual

Installation and Configuration
364
33002479 06 07/2008
I/O Scanning
Parameters
A description of the I/O scanning parameters used in this example are listed in the
following table.
Parameter Description Example
IP Address The IP address of the scanned Ethernet slave
device
192.168.1.100
Unit ID The Unit ID field is used to associate the
slave address of the device connected to an
Ethernet/Modbus gateway with the IP
address of that gateway:
z values: 1 to 255
z default value: 255
When using a bridge, enter the bridge index
(1 to 255) into this field.
255
Health
Timeout (ms)
In the Health Timeout (ms) field, you can set
the maximum interval between two
responses from a remote device. After this
time period expires, the received data
becomes invalid. The health timeout should
be longer than the repetitive rate. For a
Quantum NOE Ethernet module, the health
timeout should also be longer than the CPU
scan time.
z configure range: 1ms to 50 seconds
z interval: 1ms
200ms
Repetitive
rate (ms)
In the Repetitive rate (ms) field you can
associate an IP address with its scanning
period (increments of 16 ms).
64ms
RD Master/
Slave (read)
parameters*
Includes three parameters:
z RD Master Object: address in master PLC
into which newly read information is
stored.
z RD slave index: source address index in
the slave/remote device.
z RD length: number of words being read.
RD Master Object:%mw1
RD slave index: 1
RD length: 10
Master Object NOE 771 01
reads data from slave
address 198.168.1.100,
starting at index 1 and puts
data into NOE’s address
starting at%mw1 with a read
size of 10 words.