User manual

Transferring Data with the I/O Scanner
33002479 06 07/2008 201
I/O Scanner
Parameters
The I/O Scanner parameters are described in the following table:
Elsewhere in this guide is information about I/O scan response times for high-
performance communications modules (see I/O Scanner Response Times: Remote
Input to Remote Output, p. 210).
Using the I/O
Scanner with an
IP Router
Parameter Value
Max. No. of Devices 64: 140 NOE 771 00 (Version 2.2 or earlier)
128: 140 NOE 771 00 (Version 3.0 or later), 140 NOE 771
01, and 140 NOE 771 11 only
128: 140 CPU 651 x0
Max. No. of Input Words 4000
Max. No. of Output Words 4000
Health Timeout Value User configured: 1...65535 ms in 1 ms increments
Last Value (Input) User configured (Zero or Hold)
IP Address User configured
IP address of scanned device (Slave IP)
Local and Remote Register
Reference
User configured
Repetitive Rate User configured: 0...65535 ms in multiples of:
z 16 ms, for 140 NOE 771 xx
z 10 ms, for 140 CPU 651 xx
Unit ID User configured
Configure ID only if using a bridge
Operation through a bridge Modbus bridge: Supported
Modbus Plus bridge: Supported
Note: The I/O Scanners in the NOE 771 x1 modules and 140 CPU 651 x0 send
out requests with a Time To Live (TTL) of 10, which allows passage through
multiple routers.