BusWorks® Model 989EN U
ser’s Manual Modbus TCP/IP Digital I/O & Counters
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20
Output Functions
Output WD Time (seconds)
– Enter 1-65534 seconds to set a watchdog
time period for the outputs, or 0, or 65535 to disable the watchdog timer. If
no write activity occurs to any channels over this period, a watchdog timeout
occurs and the watchdog flag for the port is set in the Status Register.
Additionally, you can direct the unit to set its port outputs to a pre-defined
state upon watchdog timeout, or do nothing (see below).
Output Functions
…continued
Output WD State (16 bit Hex Value
)
– Upon watchdog timeout, you can
direct the unit to set its outputs to this pre-
defined state with “Take Action”
also selected, or do nothing to the outputs with “No Action” selected.
You must enter four hex digits that represent the bit settings for the 16
channels on the module. The lsb corresponds to the lowest numbered
channel of the port, the msb to the highest numbered channel.
“0” = 0000, “1”= 0001, “2” = 0010, “3” = 0011, “4” = 0100, “5” = 0101, “6” =
0110,
“7” = 0111, “8” = 1000, “9” = 1001, “A” =1010, “B” = 1011, “C” = 1100,
“D” = 1101, “E” = 1110, “F” = 1111.
For example, enter “FFFF” to turn all port outputs ON following timeout.
Output Open-Load Current (OFF/Default or ON)
– Set this ON to add a
50uA pull-down to the source to be used to detect open load faults when the
inputs are tri-stated. If ON, an open output load fault is flagged by a fault bit
in the port’s I/O status register. This pull-down current is separate from the
wetting current generators (pull-ups) of the tandem inputs. If you are driving
loads sensitive to low current in the OFF state, leave this feature OFF.
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I/O Configuration
