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Contents
MSTR Type 5 Write Global Data
This command is used in a host processor to ‘publish’ Global
Data which all slaves on the Modbus Plus highway may
access. The 1560-MBP units can be configured to read the
Control and Reference values from this Global Data table.
2.1.2 Modbus Register Map
A pre-defined register map has been provided in the 1560-
MBP unit. This map is detailed in Appendix A, and shown
below. The full memory map is dependent on the A-B device
which is connected to the 1560-MBP unit.
On power-up, the 1560-MBP unit polls the remote device
and determines the maximum number of parameters that
exist in the SCANport device. If the number is greater than
2000 the parameter list is limited to 2000.
Chapter 2 — Modbus Plus Port Functionality
Control, Reference
and Datalink IN
Miscellaneous
Parameter
40001
40011
40021
40101
4xxxx
Status, Reference
and Datalink OUT
(1)
(2)
(3)
(1)
Note that 40001 and 40002 are only accessible with MSTR
Type 1 if ‘Global Control’ is disabled in the 1560-MBP.
Represents Control and Reference Words which are
controlled by host when ‘Global Control’ is enabled.
Words 40011 up to 40020 are ‘Published’ by 1560-MBP in the
mode Global Data space. A host can access these values
using a MSTR Type 6 instruction or Peer Cop (see Appendix
C), or an MSTR Type 2 data read.
(2)
(3)
1560-MBP Modbus
Address Space
Host
Write
MSTR 1
Read
MSTR 2
Host
Global
Write
MSTR 5
Global
Read
(to Host)
MSTR 6
