Carel UE055 User Manual download pdf (Page 20)

“UEX-PLUS” +030220621 - rel. 1.1 - 30.05.2008

installeruserservice

For the connecting remove the cover , and connect cards optional

connector J19.

M.2 M.7

J19

M.8

Modbus® protocol

The protocol Modbus ® is available by selecting from the menu installer

mask supervisor.

Chapter 13.6 shows a list of variables and the corresponding addresses.

For multiple read/writes, the maximum number of “Register” or “Coil”

variables is 20.

The following functions are available:

MB_READ_COIL_STATUS 1: used to request the status (ON or OFF)

of a certain number of “Coil” variables (binary, 1 bit), starting from the

speci ed address.

MB_READ_INPUT_STATUS 2: operationally identical to the above.

MB_READ_HOLDING_REG 3: used to request the value of a

consecutive block of “Register” variables (nu-meric, 16 bit).

MB_READ_INPUT_REG 4: operationally identical to the above.

MB_FORCE_SINGLE_COIL 5: used to set the status of an individual

“Coil” variable (binary, 1 bit) to ON or OFF (specifying the address of the

bit in question).

MB_PRESET_SINGLE_REG 6: used to set the value of an individual

“Register” variable (numeric, 16 bit).

MB_FORCE_MULTIPLE_COIL15: used to set the status of a consecutive

block of “Coil” variables (binary, 1 bit) (specifying the number of bits and

number of bytes).

MB_PRESET_MULTIPLE_REG16: used to set the value of a consecutive

block of “Register” variables (nume-ric, 16 bit).

Exceptions managed:

01 illegal function

02 illegal data address

Important: for the tLAN and pLAN connections in residential

household (IEC EN 55014-1) and residential (IEC EN 61000-6-3)

environments, use shielded cable (with shield connected to GND). This

warning also applies to the cables leaving the unit.

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Carel UE055 User Manual Page 20