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mAI085-MB Actuator Interface Technical Manual /31
Distributive Intelligence
CMC INDUSTRIAL ELECTRONICS LTD
8.2.2 Read-Write Registers
Each controller has one register for the setpoint value. The setpoint value will occupy bits 0 -
11 of the setpoint value word. The factory set range of the setpoint value will be from 0 - 100,
signifying 0 - 100%. Writing a setpoint to the setpoint register will cause the actuator controller
to immediately position the actuator. The value in the setpoint register must change to initiate a
move. If the actuator faulted in the last attempted move, a different setpoint value will have to
be written to force a new move. The actuator will only move if the interface OPEN indicator is
on. Open mode can be selected by pressing the OPEN key. The interface can be configured to
start in open mode from the local menu and open mode can be forced over the Modbus
communications system through the interface command register.
Register Function
40301 Controller 1 setpoint
40302 Controller 2 setpoint
40303 Controller 3 setpoint
~ ~
40400 Controller 100 setpoint
8.2.3 mAI085-MB Special Registers
In addition, two special registers have been assigned. These registers are for controlling the
mAI085-MB Actuator Interface. The function of these registers is as follows:
Register R or R/W Function
40001 R mAI085-MB status
40300 R/W mAI085-MB commands
The mAI085-MB status register bit assignments are:
Bit Function
0 mAI085-MB input 1, 0 = input open
1 mAI085-MB input 2, 0 = input open
2 mAI085-MB input 3, 0 = input open
3 mAI085-MB input 4, 0 = input open
4 mAI085-MB output 1, 0 = output off
5 mAI085-MB output 2, 0 = output off
6 mAI085-MB output 3, 0 = output off