Basler Electric IDP-800 - Manual (Page 49)

9437600990 Rev F 43
Modbus™ Communication
When DECS-400 controllers are connected (through an Ethernet switch or hub) to an Ethernet network,
all Modbus registers of each DECS-400 can be interrogated directly through the LAN. For a complete list
of DECS-400 Modbus holding register assignments, refer to the DECS-400 instruction manual (Basler
publication 9369700990).
The Modbus holding registers of a DECS-200/DECS-200N can be interrogated through the IDP-800-A
and the holding registers of a DECS-250/DECS-250N can be interrogated through the IDP-800-C. The
amount of information (registers) available through the IDP-800-A and IDP-800-C is limited to three
categories: metering, operating modes, and setpoints.
This chapter lists the assignments and descriptions of the Modbus holding registers accessible through
the IDP-800-A (DECS-200 and DECS-200N) and IDP-800-C (DECS-250 and DECS-250N). The following
conventions apply in the register tables. In the Access column, “R” represents read access and “W”
represents write access. Data formats are described as follows.
Data Type UI6
Corresponding Built-In Data Type: UINT16, unsigned short integer
Data Range: 0 to 65,535
Data Size in Bytes: 2
Total Number of Modbus Registers to Hold Data: 1
Data Type R32_23
Corresponding Built-In Data Type: FLOAT, floating point number
Data Range: from approximately 8.43
× 10 -37 to 3.38
× 10 38
Data Size in Bytes: 4
Total Number of Modbus Registers to Hold Data: 2
IDP-800 Register Table
Data transmitted via Modbus is identified by holding registers. Table 2 lists the holding register
assignments and descriptions for the IDP-800-A and IDP-800-C. In the Access column of Table 2, “W-”
indicates write-access.
Table 2. IDP-800 Register Table
Register Data Description Access Data Format
47715 New FCR setpoint
To load this new setpoint in the AVR, it is necessary to pass
register 47723 at 1 W- R32_23
47717 New AVR setpoint
To load this new setpoint in the AVR, it is necessary to pass
register 47724 at 1 W- R32_23
47719 New VAR setpoint
To load this new setpoint in the AVR, it is necessary to pass
register 47725 at 1 W- R32_23
47721 New PF setpoint
To load this new setpoint in the AVR, it is necessary to pass
register 47726 at 1 W- R32_23
47723 Load new FCR setpoint to AVR
0= No change ; 1=change W- UI16
47724 Load new AVR setpoint to AVR
0= No change ; 1=change W- UI16
47725 Load new VAR setpoint to AVR
0= No change ; 1=change W- UI16
47726 Load new PF setpoint to AVR
0= No change ; 1=change W- UI16
IDP-800 Modbus™ Communication