Lochinvar 1.0- 1.3- 1.5 operation manual Modbus Exception Codes, Name

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Modbus Instructions

2Configuration

Modbus Exception Codes

 

 

MODBUS Exception Codes

 

 

 

Code

Name

Meaning

 

 

 

 

 

The function code received in the query is not an allowable action for the server

 

 

(or slave). This may be because the function code is only applicable to newer

01

ILLEGAL FUNCTION

devices, and was not implemented in the unit selected. It could also indicate that

 

 

the server (or slave) is in the wrong state to process a request of this type, for

 

 

example because it is unconfigured and is being asked to return register values.

 

 

 

 

 

The data address received in the query is not an allowable address for the server

 

 

(or slave). More specifically, the combination of reference number and transfer

 

 

length is invalid. For a controller with 100 registers, the PDU addresses the first

 

 

register as 0, and the last one as 99. If a request is submittted with a starting

02

ILLEGAL DATA ADDRESS

register address of 96 and a quantity of registers of 4, then this request will

successfully operate (address-wise at least) on registers 96, 97, 98, 99. If a

 

 

 

 

request is submitted with a starting register address of 96 and a quantity of

 

 

registers of 5, then this request will fail with Exception Code 0x02 “Illegal Data

 

 

Address” since it attempts to operate on registers 96, 97, 98, 99 and 100, and

 

 

there is no register with address 100.

 

 

 

 

 

A value contained in the query data field is not an allowable value for server (or

 

 

slave). This indicates a fault in the structure of the remainder of a complex

03

ILLEGAL DATA VALUE

request, such as that the implied length is incorrect. It specifically does NOT

mean that a data item submitted for storage in a register has a value outside the

 

 

 

 

expectation of the application program, since the MODBUS protocol is unaware of

 

 

the significance of any particular value of any particular register.

 

 

 

04

SLAVE DEVICE FAILURE

An unrecoverable error occurred while the server (or slave) was attempting to

perform the requested action.

 

 

 

 

 

 

 

Specialized use in conjunction with programming commands. The server (or

 

 

slave) has accepted the request and is processing it, but a long duration of time

05

ACKNOWLEDGE

will be required to do so. This response is returned to prevent a timeout error from

 

 

occurring in the client (or master). The client (or master) can next issue a Poll

 

 

Program Complete message to determine if processing is completed.

 

 

 

 

 

Specialized use in conjunction with programming commands. The server (or

06

SLAVE DEVICE BUSY

slave) is engaged in processing a long -- duration program command. The client

 

 

(or master) should re-transmit the message later when the server (or slave) is free.

 

 

 

 

 

Specialized use in conjuction with function codes 20 and 21 and reference type 6,

 

 

to indicate that the extended file area failed to pass a consistency check. The

08

MEMORY PARITY ERROR

server (or slave) attempted to read record file, but detected a parity error in the

 

 

memory. The client (or master) can retry the request, but service may be required

 

 

on the server (or slave) device.

 

 

 

 

 

Specialized use in conjunction with gateways, indicates that the gateway was

0A

GATEWAY PATH UNAVAILABLE

unable to allocate an internal communication path from the input port to the output

 

 

port for processing as the request. Usually means that the gateway is

 

 

misconfigured or overloaded.

 

 

 

 

GATEWAY TARGET DEVICE

Specialized use in conjunction with gateways, indicates that no response was

0B

obtained from the target device. Usually means that the device is not present on

FAILED TO RESPOND

 

the network.

 

 

 

 

 

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Contents Modbus Communication Instructions Sync Models 1.0 1.3Contents Configuration AddressingModbus Board Diagnostics Timing SpecificationsData Transmission Mode ParityModbus Function Set DecModbus Exception Codes NameMemory Map Primary Data TablesSync Boiler Memory Map Configuration Bits Holding RegistersWiring Requirements Physical WiringSecondary Secondary Smart Touch Control Module Primary Typical Boiler System Wiring 4Control LocationPhysical Configuration Cascade with individual Monitoring Demand Configuration Unit OperationUnit Operation with Modbus Communications Hot Water Generation DHW with direct controlDHW with remote control CascadeMonitoring Only Rate Rate and Temperature ConversionsTemperature Deg C Deg F VoltagesTroubleshooting Installation / Replacement Procedure Lockout Codes Input Registers 30016Diagrams LOW Voltage 120 VAC High Voltage2Ladder DiagramPart 3Wiring Diagram

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