Installation Instructions
Instruction Manual
D103460X012
D3 Valve with easy-Drive Actuator
November 2013
29
A.2.15 Analog Input Initialized
The analog input has been detected as having a control signal within the expected range of 3-20mA. If the analog
input is the selected control signal then this will activate the valve after the startup period.
A.2.16 Start Delay Active
This is a flag set during the startup phase of operation, if this is set then the valve may be recalibrated by sending the
calibration signal sequence (100% demand followed by 0%). It is cleared to indicate normal operation (recalibration will
then require a command to Modbus register 40003).
A.3 Register Description
A.3.1 4 0001 Position Demand — Proportional [Read & Write]
Register: 40001, Address 0x0000 (0).
Function code: 0x10 — Write Multiple registers,
0x06 — Write Single register, or
0x03 — Read Holding registers.
Description: This is a value between 0 and 100% to demand a valve position. This register will only be used by
the system if the control source (set by register 40035) is set for Modbus RTU control. If the
control type (set by register 40034) i s On/Off then value will be resolved with a boolean set
operation for a Open/Closed position demand variable output (e.g. Values 0-49 = ’0’ and
50-100 = ‘100’). This variable needs to be set to 100% then 0% after a power-up to calibrate an
un-calibrated system.
A.3.2 40002 Reset Diagnostics [Read & Write]
Register: 40002, Address 0x0001 (1).
Function code: 0x10 — Write Multiple registers,
0x06 — Write Single register, or
0x03 — Read Holding registers.
Description: This is a modbus request to reset the system from a fault state (indicated if the Diagnostics flags
register has any set faults). Writing a decimal 1 to the register will start a reset process only if
the system has a fault, otherwise the write will be ignored. Once the fault reset request has
been acknowledged the register will be set to decimal 0. Bit assignments are shown in table 5.
A.3.3 40003 Recalibrate Demand [Read & Write]
Register: 40003, Address 0x0002 (2).
Function code: 0x10 — Write Multiple registers,
0x06 — Write Single register, or
0x03 — Read Holding registers.
Description: Writing a value of 1 to this register will force the system to clear any calibration information and
go through a cycle of calibration.
A.3.4 4 0004 Analog Cal at 0% [Read & Write]
Register: 40004, Address 0x0003 (3).
Function code: 0x10 — Write Multiple registers,