Emerson Unidrive M700 - Page 99

SI-Ethernet User Guide 99
Issue: 1
Safety
information
Introduction
Mechanical
installation
Electrical
installation
Getting started Parameters
Key features
and Protocols
PC Applications Security Diagnostics
Glossary of
terms
Index
This parameter allows for enabling and disabling input assembly object consistency.
Under normal conditions, cyclic data is sampled and transmitted at the Requested
Packet Interval (RPI). However, if an option module was in the process of modifying the
mapped parameters while these parameters were being sampled, then the data
transmitted across the network may not be consistent across the entire assembly
object. If read consistency is enabled (and a trigger parameter specified in Input
assembly object consistency trigger parameter (S.20.027)) then data will only be
sampled and transmitted to the PLC or EtherNet/IP master when the trigger parameter
Input assembly object consistency trigger parameter (S.20.027) contains a non-zero
value. This trigger parameter will then be set to zero after the data has been transmitted.
It is therefore possible, by controlling the trigger parameters, that a user program in the
drive or option module can ensure that the values in the cyclic data parameters are not
sampled until all values are updated.
Whether consistency is enabled or not, data will always be consistent for an individual
parameter, i.e. all 4 bytes of a 32 bit value will be consistent.
This parameter specifies the parameter to use for triggering input assembly object
consistency. See Input assembly object consistency enable (S.20.026) for more
information on consistency.
S.20.026 Input assembly object consistency enable
Minimum 0 Maximum 1
Default 0 Units
Type 1 Bit User Save Update Rate
Module reset, EtherNet/IP
interface reset or EtherNet/
IP interface enable
Display Format None Decimal Places 0
Coding RW
If read consistency is enabled, then at reset or at power-up, the value in the trigger
parameter is set to zero.
S.20.027 Input assembly object consistency trigger parameter
Minimum
0
(Display: 0.00.000)
Maximum
499999
(Display: 4.99.999)
Default
0
(Display: 0.00.000)
Units
Type 32 Bit User Save Update Rate
Module reset, EtherNet/IP
interface reset or EtherNet/
IP interface enable
Display Format Slot Menu Param Decimal Places 0
Coding RW, BU
NOTE