I-O Display Systems Basic I/O Product - Manual (Page 36)

Setup & Installation 2
2-19(Vol.1)
Hardware error codes:
When the BASIC I/O is initially powered up, it goes through an internal self test. If any of the
self-diagnostics fail, the unit will report an appropriate error code on the sequential display
and halt.
Error Code 3
If a solid 3 appears in the sequential display, recycle power without touching the pushbutton.
This does not mean that there is a problem, it means it is in factory test mode. Recycle power
without holding down the pushbutton.
Other error codes
If 0, 1, 2, 4,6, or 7 appear on the display permanently there is a problem. Recycle power. If
that does not resolve the error condition, please call duTec at 800-248-1632.
Hardware watchdog
The hardware watchdog acts automatically in the event of a hardware or firmware failure and
responds within one second. The hardware watchdog turns all outputs off, and resets the
BASIC I/O. Do not confuse this with the programmable communication watchdog delay
instruction.
Fuses
A plug-in 5 amp, UL rated, fuse is installed between the minus field ierminal and the I/O
module. These fuses are generally only needed to protect output modules. Optional fuse
values are available for special output protection requirements. Fuses are installed in sockets
located on the module board next to the module. Thermocouples and RTD inputs do not
utilize ther terminal block and therefore do not make use of the fuse.
Sensor/ Actuator I/O wiring
Analog or digital modules can be placed at any module position. However it is good practice
for noise pickup, debugging and maintenance reasons to group and wire similar module types
together. For minimum crosstalk between input and output wiring, input modules should be
located at one end followed by output modules.
Modules should NEVER Be installed or removed while power is applied to the BASIC I/O.
Following insertion in their respective sockets, modules should be secured with the captive
screw.