Rockwell Automation 1771-PD PID MODULE (+DU) - Manual (Page 77)

Programming
Chapter 3
3Ć34
Table 3.G
Status Block Words
Word Title Abbreviation
Both Loops
W57
W58
W59
W60
For future use
Alarm
Next Block Start Address
Loop Time/Diagnostic
Loop 1
W61
W62
W63
W64
W65
W66
W67
Loop 1 Status
Loop 1 Error
Read Loop 1 Output
Read Analog Input 1
Read Process Variable 1
Read Tieback Input 1
Read Feedforward Value 1
ERROR1
READ V1
READ IN1
READ PV1
READ TIE1
READ FFV1
Loop 2
W68
W69
W70
W71
W72
W73
W74
Loop 2 Status
Loop 2 Error
Read Loop 2 Output
Read Analog Input 2
Read Process Variable 2
Read Tieback Input 2
Read Feedforward Value 2
ERROR2
READ V2
READ IN2
READ PV2
READ TIE2
READ FFV2
W57 This word is reserved for future use. It will contain 0000.
W58 Alarm Word. This word contains alarm information for both
loops. It contains information concerning possible programming
errors and operating faults. Specific loop faults are found in the
status word W61 for loop 1 (W68 for loop 2). Bits 17 through 00 of
alarm word W58 are defined below and summarized in Figure 3.9.
W58 B17, B16 Block Identifiers. These two bits identify the status
block. Both bits will be read as 0 by the PC processor.
W58 B15 Dynamic Block Error. Set to 1 the previously transferred
dynamic block contained a programming error. To identify the error,
W01 B07 must be set to 1 so that the loop time/diagnostic word W60
can report diagnostic information. The upper byte of W60 will
contain the dynamic block error code. See word W60 below for
additional information.
W58 B14 Loop Block Error. Set to 1 the previously transferred
loop 1 or loop 2 block contained a programming error. To identify