S908 Network Limitations in an M580 System

Introduction

M580 architectures with X80 remote drops that include a 140CRA31908 module observe the limitations described below.

Limitations

Observe these limitations:

Function	Support	Comment
CCOTF	none	There is no support to add or delete X80 remote drops that contain a 140CRA31908 adapter module.
I/O Sniffing	none	I/O sniffing is not supported by M580 architectures.
I/O vision	state RAM	The state RAM and topological I/O vision are supported to program the I/O over the S908 network. The device DDT is not supported.
Quantum Safety modules	none	Quantum Safety modules can be configured in the M580 network only when they are managed by a Quantum Safety PLC.
section scheduler	none	The 140CRA31908 module does not support the section scheduler mechanism.
segment scheduler	none	The 140CRA31908 module does not support the segment scheduler mechanism.
used task	MAST only	Only the MAST task can process the I/Os over S908. The 140CRA31908 module, therefore, supports the MAST task for only the I/O modules configured in its local rack.
200 Series	with adapter	M580 architectures support 200 Series I/O when the P451 or P453 interface is adapted with a J290 or J291 S908 I/O adapter.

NOTE: In the M580 configuration, assign at least one Quantum S908 remote drop with address 2, 3, 4, 5, 6, 7, 8 or 9.

adapter

An adapter is the target of real-time I/O data connection requests from scanners. It cannot send or receive real-time I/O data unless it is configured to do so by a scanner, and it does not store or originate the data communications parameters necessary to establish the connection. An adapter accepts explicit message requests (connected and unconnected) from other devices.