Specifications

Analog Output Modules
31007715 6/2008 261
Output
Status Registers
The input data and I/O status process image is a reserved block of 4096 16-bit
registers (in the range 45392 through 49487) that represent the status of all the I/O
modules (along with the data for the input modules) on the island bus.
The STB AVO 1250 is represented by two contiguous registers—the first shows
output status for channel 1 and the second shows output status for channel 2. The
STB AVO 1250 can detect and report voltage overflow and voltage underflow
conditions on each channel.
A voltage overflow occurs when the voltage of an output channel is set to 10.24 V
(represented by the value 32 752 in the channel’s data word). A voltage underflow
can occur when the module is configured to operate at +/-10 V and when the voltage
of an output channel is set to -10.24 V (represented by the value -32 752 in the
channel’s data word).
The six LSBs in each register represent the status of each output channel:
1 Bit 0 represents global status (GS). It has a value of 0 when no errors have been detected.
It has a value of 1 when bit 1 has a value of 1.
2 Bit 1 represents the status of PDM voltage on the island’s actuator bus. It has a value of 0
when no PDM voltage errors are detected. It has a value of 1 when power is shorted. A
PDM short turns on the GS bit (bit 0).
3 Bit 2 represents the presence or absence of an OVW. It has a value of 0 when the voltage
is less than or equal to 10 V. It has a value of 1 when the numerical count is greater than
32 000. An OVW does not turn on the GS bit (bit 0).
4 Bit 3 represents the presence or absence of an over-voltage error (OVE). It has a value of
0 when the numerical count is less than 32 752 and a value of 1 when the voltage equals
32 752. An OVE does not turn on the GS bit (bit 0).
5 Bit 4 represents the presence or absence of a UVW. If the module is configured for +/-10 V
operations, it has a value of 0 when the numerical is greater than or equal to -32 000 and
a value of 1 when the count is below -32 000 but above -32 752. A UVW does not turn on
the GS bit (bit 0).
5 Bit 5 represents the presence or absence of a UVE. If the module is configured for +/-10 V
operations, it has a value of 0 when the numerical count is greater than -32 752 and a value
of 1 when the voltage equals -32 752. A UVE does not turn on the GS bit (bit 0).
STB AVO 1250 Status Register Format
always 0
67
1
23
450
1415
9
10
111213
8
GS (see 1)
PDM (see 2)
OVW (see 3)
OVE (see 4)
UVW (see 5)
UVE (see 6)
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