Meggitt VM600 User Manual

VM600 networking manual MAVM600-NET/E 8 - 15
Edition 9 - February 2018
AMC8 card
SETTING UP A MODBUS CONNECTION (CPUM SW VERSION 067 OR EARLIER)
8.6.6 Address map
The MPC4 card’s register definitions for Modbus can be found in the address map tables
given in Appendix A: MPC4 Modbus register definitions. The Modbus register starting
addresses can be determined using the information given in the tables.
8.7 AMC8 card
The information is this section applies to the implementation of the Modbus software interface
for VM600 racks as used by CPUM cards running firmware version 067 or earlier.
Improved Modbus functionality is provided by CPUM cards running firmware version 071 or
later. See 9 Setting up a Modbus connection (CPUM firmware version 071 or later) for more
information.
The following sections describe the values or configuration parameters, either discrete or
analog, that can be retrieved using the four Modbus functions. (See 8.4.3 Modbus functions
supported by the VM600 for a list of these functions.)
8.7.1 Discrete values (coils)
Modbus function 01 is the read coil registers function. It is used to read the configuration of
the alarms (discrete values), whether they are enabled or not. These configurations were
made in the MPS Software in the Processing and alarms screen (for the channels) and
under the Alarms screen (for the multi-channels).
The four alarm outputs that can be enabled are:
•Alert− Low
•Alert+ High
• Danger− Low
• Danger+ High.
8.7.2 Discrete values (discrete inputs)
Modbus function 02 is the read discrete inputs function. It is used to retrieve discrete values
such as channel status (error and fail) and alarm register.
The five following registers define whether the system is in an Alert condition for each channel
and multi-channel, or if there is a Global Channel OK Failure.
•Alarm+
•Alarm−
• Danger+
• Danger−
• Global Channel OK Fail.
The ten following registers specify whether there is an error or a standby state for each
channel and multi-channel.
• ADC Error
• ADC Standby
• ADC PLL Lock Error
• ADC Transmission Error
• ADC Dynamic Configuration Error

Meggitt VM600 Specifications

General

Brand	Meggitt
Model	VM600
Category	Measuring Instruments
Language	English