AMCI NEXUS NX2A4E2 User Manual Download Page 25

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NX2A4E2 User Manual

ATA

ORMATS

Input Data Formats (continued)

Single Resolver Data Format

Each Data Block contains the data for two single resolver transducer channels. Note that if the first two chan-
nels are programmed as a dual-resolver interface, the input data in words 0 through 7 will follow the

Dual

Resolver Data Format

that is found on page 26. The same is true for words eight through fifteen if the last

two channels are programmed as a dual-resolver interface.

Channel Status Word

Figure R2.7 below shows the format of the status word for a single resolver transducer channel. Note that the
Acknowledge bit, bit 15, is only available in word zero. This is bit 15 of the CH1 Status Word.

Figure R2.7 Single Resolver Channel Status Word Format

Bit 15:

Acknowledge –

Used to control the flow of programming data to the NX2A4E2. The NX2A4E2 sets

this bit in response to the Transmit bit being set by the host. Programming error bits in the Channel
Status word is only valid while the Acknowledge bit is set. Once this bit is set, it will remain set until
your host controller resets the Transmit Bit.

Bit 14:

Module_Fault –

Set to “1” if there is a hardware fault with the NX2A4E2. Note that this bit will also

be set if the is a checksum error with the onboard non-volatile memory.

Bit 13:

Transducer_Fault –

This bit is set to “1” when the channel is in a transducer fault state. If the chan-

nel’s front panel status LED is blinking green, the fault can be cleared by issuing a programming
block with the Reset_Error bit set to “1”. If the status LED is blinking red, then there is an error in
the resolver signals. This can be a wiring issue, or the programmed value for the Resolver Type may
not be correct for the sensor.

Bit 10:

Channel_Type –

Will be set to “0” when the channel is configured as a single-resolver interface chan-

nel. Set to “1” when the channel, and its pair, are programmed as a dual-resolver interface channel.

Bit 09:

VelocityAtZero –

This bit is set to “1” when the velocity reading of the channel is zero. This bit is

reset to “0” if the transducer is rotating or there is a transducer fault.

Bit 08:

Motion_Direction –

Reset to “0” when the counts are increasing. Set to “1” when the counts are

decreasing. This bit remains in its last state when no motion is occurring.

Bit 07:

Message_Ignored –

Set to “1” when you attempt to program a parameter or channel if a parameter

error has already been flagged for a different parameter. This bit is also set to “1” if you attempt to
preset the position on a channel that is in transducer fault.

Bit 06:

Command_Err –

Set to “1” under the following conditions:



Any of the reserved bits in the command words are set to “1”



You attempt to program more than one channel at a time



You attempt to preset channels 2 or 4 when they are part of a dual-resolver channel.

RESERVED: Bit will equal zero.

Channel 1 Status Word only.
‘0' on all other channels.

Channel ‘n’ Status