Rockwell Automation PLC-5 Fieldbus Solutions for Integrated Architecture User Manual - Manual (Page 186)

Publication 1757-UM006A-EN-P - May 2002
A-6 Standard Function Block Parameters
Table A.14 BLOCK_ALM
Table A.15 BLOCK_ERR
Table A.16 BYPASS
Classification Record
Description The block alarm is used for all configuration, hardware, connection failure, or
system problems in the block. The cause of the alarm is entered in the
sub-code field. The first alarm to become active will set the Active status in
the Status attribute. As soon as the Unreported status is cleared by the alarm
reporting task, another block alarm may be reported without clearing the
Active status, if the sub-code has changed.
FF Data Type DS-72
Usage C/Alarm
Length 13
Storage Dynamic
Remarks The data type describes discrete alarms using the following five elements:
•1 Unacknowledged
•2 Alarm State
•3 Time Stamp
•4 Subcode
•5 Value
Classification Simple Variable
Description Reflects the error status associated with the hardware or software compo-
nents associated with a block. It is a bit string that can show multiple errors.
FF Data Type Bit String
Usage C/Block Error
Length 2
Valid Views VIEW_1, VIEW_3
Storage Dynamic
Classification Simple Variable
Description Provides the means to bypass the normal control algorithm. When BYPASS is
On, the setpoint value is directly transferred to the output. To prevent a bump
upon BYPASS switching, the setpoint automatically initializes to the output
value or process variable and sets the path broken flag for one execution.
FF Data Type Unsigned 8
Range 1: Off
2: On
Usage C/Contained
Length 1