Communication Error Codes

This topic discusses the Productivity Suite Communication Error Codes that may be reported by the Productivity CPU.

Note: The only time you will see Communications Error Codes is when the CPU is the Master of a Communications Network.

To simplify the process of identifying a possible Error, the Productivity Suite CPU will automatically report to a specific memory location an Error Code that helps identify the existing issue. The Error Codes are reported in the Exception Response String Tag specified in the instruction as shown below.

The Exception Response String field is available on the following instructions:

GS Drives Read	Modbus Write	Dataworx Request
GS Drives Write	Network Read	Network Read/Write
Modbus Read	Network Write	ViewMarQ/Write
Modbus Read/Write	EtherNet/IP Explicit Message

The Table shown below provides a list of Productivity Suite Communication Error Codes that may be reported by the Productivity CPU.

Productivity Suite Communication Error Codes

Exception Response String	Description	Suggested Fix
01:ILLEGAL FUN	Illegal Function. Function Code not supported	Check instruction or connected device and correct Function code or address range selected
02:ILL DATA ADR	Illegal Data Address. Address out of range. This error is typically generated when a Modbus address has been requested that does not exist in the CPU	Check instruction or connected device and correct Function code or address range selected
03:ILL DATA VAL	Illegal Data Value. This error is typically generan the Modbus request sent to the CPU is formed incorrectlyted whe	Check the Modbus request against the Modbus protocol specification (www.modbus.org) to verify that it was formed correctly
04:SLAVE FAIL	Slave Device Failure. An unrecoverable error occurred while the slave was attempting to perform the requested action.	Check connected device
05:ACK	Acknowledge	Typically, this is returned when a Slave will take a longer than usual amount of time to respond. The Master should reduce the poll frequency for this device.
06:SLAVE BUSY	Slave Device is Busy. This error is typically due to excess communications to the EDRV	Slow down the poll rate in the GS instruction. If the slave is not a GS Drive, reduce the poll frequency to this device and send the request again.
07:NAK	Negative Acknowledge	This is usually only returned from a Function Code 13 or 14 which is not supported by the P series CPU. Check the manufacturer's documentation to see why this error can be returned.
08:MEM PAR ER	Memory Parity Error. The slave device detected a parity error in memory.	This is usually only returned from a Function Code 20 and 21 in most devices which is not supported by the P series CPU. Check the manufacturer's documentation to see why this error can be returned.
0A:GATE PATH ER	Gateway Path Unavailable. Specialized use in conjunction with gateways, indicates that the gateway was unable to allocate an internal communication path from the input port to the output port for processing the request. Usually means the gateway is misconfigured or overloaded.	Verify the Gateway's configuration and/or possibly reduce the poll frequency for this device.
0B:GATE TARG ER	Gateway Target Device Failed to Respond. Specialized use in conjunction with gateways, indicates that no response was obtained from the target device. Usually means that the device is not present on the network.	Verify the Gateway's configuration and check that the correct Slave Node number has been configured in the MRX or MWX instruction.
StartIdx Error	Local project starting index element does not exist	Change starting index to match local tag array index
EndIdx Error	Local Project ending index element does not exist	Change ending index to match local tag array index
Remote StartIdx Error	Remote project array starting index does not have enough subsequent elements to operate currently.	Change starting index to match remote tag array index
Remote EndIdx Error	Remote project array ending index does not have enough subsequent elements to operate currently	change ending index to match remote tag array index
String Size Error	Local project number of characters requested exceeds local string tag length.	Change assigned number of characters <= local string tag.
Remote Str Size Error	Local project number of characters requested exceeds remote string tag length.	Change assigned number of characters <= remote string tag.