User`s manual

Watlow Controls Communications Guide 18
Handling Error Codes
Error codes are divided into two types.
Read error codes and write error codes are
called exception codes. Reading from a
register that does not exist or is currently
disabled will typically respond with a large
out of range value such as -32000, -32001,
or -32002. The Series 988 returns a value
of zero.
Writing to a register that is not supported,
is inactive or out of range will return a
packet with 0x80 added to the command
sent. The byte following this will contain
the value 0x01 for illegal command, 0x02
for illegal address, or 0x03 for illegal data
value. Writing to a read only register will
return an exception code 0x02.
See your user's manual for exact values and
definitions.
User Responsibility
Users must refrain from altering prompts
that do not appear on the controller’s
front panel or are not included on the
specific model. For example, do not send
an A2LO command to a unit not equipped
with an alarm for output 2.
Most of Watlow controllers contain a
register to disable saving of the current set
point to EEPROM. When using your PC
or PLC to control the set point in the
Watlow controller, the EEPROM may be
prematurely damaged. There is a limit to
the number of times you can store
information in the EPPROM. PCs can
quickly reach this limit if the set point is
continually changed, as in a ramping
controller. Disabling this feature will
prevent this damage.
Care must also be taken that the process
can not cause damage to property or
injury to personnel if the wrong
commands are sent due to operator error
or equipment malfunction. Be sure to use
limit devices on the equipment to prevent
system runaway.
Purchase an HMI package
Not all HMIs are equal in performance. Set
up and operation / function of each
manufacturer’s HMI package is unique.
Industrial controllers operate in a harsh,
electrically noisy environment. This can
cause less robust HMIs to work
intermittently or not at all. In addition,
the platform (PC or PLC) which runs the
HMI is subject to failures causing
unpredictable operation of your process.
Watlow has not tested the HMIs listed
with the exception of ANAWIN and
WATLINK. This list is provided as
informational only. Watlow makes no
claims as to the performance or
compatibility with any HMI software
package.
Anawin by Watlow Anafaze
334 Westridge Drive
Watsonville, CA 95076
Phone [phone]
http://www.watlow.com
WATLINK by Watlow Controls
1241 Bundy Blvd
Winona, MN 55987
Phone [phone]
http://www.watlow.com
CONTROLWARE by Controlware
245 Northland Blvd
Cincinnati, OH 45246-3603
Phone [phone]
http://www.controlware.com
Cimplicity by GE Fanuc
Phone [phone]
http://www.gefanuc.com
Genesis by Iconics
100 Foxborough Blvd
Foxborough, MA 02035
Phone [phone]
http://www.iconics.com