Rockwell Automation 1771-PD PID MODULE (+DU) - Manual (Page 17)

Assembly and Installation
Chapter 2
2Ć4
Selection Procedure (Part A)
Begin with digital board features using Table 2.B.
1. The hard fault response of the module is selected first. A hard fault
occurs when a module failure is detected in the event of a failure, the
analog output will either maintain the last value or will be set to the
minimum or maximum value. A single choice is made for both
outputs as to whether they hold last value or go to
minimum/maximum.
Select hold last value or go to minimum/maximum for the hard fault
response. Record your selection on Table 2.B by circling RIGHT for hold
last value or LEFT for minimum/maximum.
NOTE: If hold last value is selected for hard fault, output 1 and output 2
must still be selected for minimum or maximum. The selection
determines the state of outputs at module power-up (green LED flashing)
until the load/enter sequence is complete, or power-down of +5V dc. See
Table 2.C.
Table 2.B
Programming Plug Selections: Digital (leftĆhand) Board
Location Function Position
E1 Factory Configured OUT
E2 [1] Hard fault response:
Hold last value
Minimum/maximum value
RIGHT
LEFT
E3 through E9 Factory Configured See figure 22
E10 Source of +5V dc
Backplane
External supply
IN
OUT
[1] The selection for E2 affects both outputs the same. The choice of minimum value or maximum
value for the hard fault output must be made on the analog board regardless of the choice of
E2. (see text and analog board plugs E4 and/or E5).