Modbus package:“illegal instruction" error

khorie · ‎Feb 01, 2016

Hi,

I met the “illegal instruction"error when I run the luaSciptResouce in WebSocket EMS + modbus package.

It happens on Linux ARM (not HFPU.), but does not happen on Windows10 with the same configuration.

It happens in Modbus/TCP, but does not happen in Modbus/RTU.

Did anyone see this error ? 　If so, could you tell me how did you solved?

I searched the google and some Linux article is saying it could happen by when it was built for different CPU/OS type, or divided by zero.

Off course I installed the correct version of distribution depend on the OS and CPU type.

-Web Socket EMS:

-MicroServer-5-3-0-539-Win32.zip for windows

-MicroServer-5-3-0-539-Linux-ARM.zip for Linux ARM without hardware FPU.

- http://marketplace.thingworx.com/downloads/netcomm-wireless-6200-01/

MicroServer_80.zip (extracted from the starter kit of NetComm-6200-01.zip)

This is the original one which my edge device was certified as ThingWorx Ready.

-Modbus package

https://community.thingworx.com/community/developers/blog/2015/12/13/modbus-plc-simulator

TWEMS MODBUS Package_Linux_ARM.zip for Linux ARM

TWEMS MODBUS Package_Windows.zip for windows

<config.lua >

This error happens when I specify the Modbus/TCP as follows.

scripts.modbus_handler = {

file = "modbus_handler.lua",

name = "modbus_handler",

host = "192.168.10.50", <---This specify TCP

}

This error does not happen when I specify the Modbus/RTU as follows.

scripts.modbus_handler = {

file = "modbus_handler.lua",

name = "modbus_handler",

serial_port = "ttyUSB0", <-- This specify RTU

baud_rate = "9600",

read_timeout = "1000"

}

(initial part of log are abbreviated)

Persisted Props:

file = thingworx.lua

max_run_time = 20

GlobalProps:

config_file_path = /opt/microserver/etc

log_level = DEBUG

rap_host = 127.0.0.1

rap_port = 8000

script_clib_path = ***************** (abbreviate)

script_directory = ***************** (abbreviate)

script_library_path = ***************** (abbreviate)

script_resource_host = 127.0.0.1

script_resource_port = 8002

[DEBUG] 2016-02-01 20:32:10,688 luaScriptProxy::runScript: Starting Script

[DEBUG] 2016-02-01 20:32:10,689 luaScriptProxy::getStatus: Script Thingworx status = Ready

[FORCE] 2016-02-01 20:32:10,699 httpServer: starting http server port=8002

[DEBUG] 2016-02-01 20:32:10,700 httpServer: http server bound to port=8002.

[DEBUG] 2016-02-01 20:32:10,701 luaScriptProxy::execute: Script Thingworx now executing

Illegal instruction <---This error!

#

Thank you,

Kunio

khorie · ‎Feb 05, 2016

HI .

I could solved this error. Here I report how I solved this .

The solution is as follows.

I replaced the file (1) by (2) , then the error was not happen , and Modbus/TCP seems working fine as of now.

(1)microserver/etc/thingworx/community/clibs/socket/core.so (this came from ThingWorx )

(2)/usr/lib/lua/5.1/socket/core.so (this is part of original firmware of my M2M device ( NetComm Wirelss NTC6200) .)

I hope this helps someone who meet similar issue in future.

Thank you

Kunio