Rockwell Automation 1771-PD PID MODULE (+DU) - Manual (Page 86)

Programming
Chapter 3
3Ć43
W61(W68)B17 Sign of Loop Error. Reset to 0 the sign of the error
value in word W62(W69) is positive. Set to 1 the sign is negative.
W61(W68)B16 Sign of Read Process Variable. Reset to 0 the sign
of the scaled process variable in word W65(W72) is positive. Set to
1 the sign is negative. This bit has meaning only when process
variable scaling has been selected by W30(W50)B17 = 1.
W61(W68)B15 Error <Maximum Negative Error. Reset to 0 the
error value is greater than or equal to the maximum negative error
EMN in word W21(W41). Set to 1 the loop error is less than the
maximum negative error. The bit status is reported whether or not
error limiting is selected.
W61(W68)B14 Error>Maximum Positive Error. Reset to 0 the
error value is less than or equal to the maximum positive error EMP
in word W22(W42). Set to 1 the loop error is greater than the
maximum positive error. The bit status is reported whether or not
error limiting is selected.
W61(W68)B13 Sign of Feedforward Value. Reset to 0 the sign of
the feedforward value in word W67(W74)is positive. Set to 1 the
sign is negative.
W61(W68)B12 Load/Enter Complete. Reset to 0 when the module
receives a dynamic block transfer with the load bit W01 B06 = 1.
Bit B12 will be set to 1 at the completion of the load/enter sequence
after the module successfully processes the dynamic block with the
enter bit W01 B03 =1. The bit will remain set to 1 until a new
load/enter sequence is attempted. (W68 B12 in loop 2 will be
returned as 0.) Refer to sections titled Power-Up Load/Enter
Sequence and Load/Enter Sequence for additional information.
W61(W68)B11 Error within Dead Band. Reset to 0 the error for
the loop is outside the dead band established by the value in word
W23(W43). Set to 1 the error is inside the dead band. The bit status
is reported whether or not the dead band feature is selected.
NOTE: When the error enters the dead band range, the bit will not
be set until the error reaches (crosses) zero. It will be reset when the
error exceeds the dead band value.