IAI America XSEL Ethernet - Manual (Page 23)

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4.3 Setup Procedure for Exception Status Support
The X-SEL Ethernet option supports the function that notifies the host of an error condition (the upper
two digits of the error number) of the X-SEL controller using an exception code stored in Modbus/TCP.
By setting bits 0 to 3 of I/O parameter No. 129 to “2” (HEX), any error occurring in the X-SEL controller
can be indicated to the host controller via Modbus/TCP.
The EXCEPTION status stores the upper two digits (one byte) of the system error number (consisting
of three digits). When this EXCEPTION status is used, provide measures appropriate for the error
level by referring to the descriptions in the “Error Level Control” section of the operation manual for the
X-SEL controller.
(Note)
The system error number cannot be specified from the EXCEPTION status (two digits). (This
is because the error number consists of three digits.)