Rockwell Automation 1771-QB Linear Pos. - Manual (Page 83)

Formatting Module Data (WRITES)
Chapter 7
7Ć4
Bit 3 – Binary/BCD
Bit 3 determines the format of the data contained in block transfer reads and
writes. BCD format provides compatibility with older programmable
controllers. Binary format provides compatibility with the PLC-5, which uses
integer (16-bit 2’s complement) data.
Bit 4 – Discrete Inputs
Setting this bit to 1 disables the discrete inputs. The state of the inputs can still
be monitored by the status block, but the function of each input is disabled.
Discrete faults are reported in the status block, but OUTPUT 2, if configured as
the loop fault output, is not activated when a discrete input fault occurs. The
discrete input section does not have to be powered when the inputs are disabled.
If disabled, the function of each input is as follows:
Discrete Input: Function:
stop input disabled
auto/manual input auto
jog inputs disabled
start input disabled
Bit 5 – Analog Outputs
Setting this bit to 1 disables the analog outputs by opening internal relays.
Analog faults are still reported in the status block, but OUTPUT 2, if configured
as the loop fault output, is not activated when an analog fault occurs. The
analog section does not need to be powered when the analog outputs are
disabled.
The percent analog output is displayed in the status block even if the analog
outputs are disabled. This allows you to test the programmable controller
program.
Bit 6 – Transducer Interface
Setting this bit to 1 disables the transducer interface. The interrogate pulse is
still sent and feedback faults are reported, but the transducer reading is ignored.
The transducer section does not need to be powered when the transducer
interface is disabled.
When the transducer interface is disabled the module will simulate transducer
feedback to help you test the programmable controller program. The position
changes at the programmed acceleration, velocity and deceleration when a
setpoint, motion segment or jog command is issued. The following error will
remain zero.