User Manual

Logical I/O blocks
Output blocks
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19.3 Output blocks
An output block is the logical image or memory map of a command, and describes its properties. Within the
program, the Present Value is made available to the block as a program value. The block converts the
program value and transmits the raw data to the physical I/O.
If an output is deleted from an existing system in the course of a modification, the I/O module will retain
the last valid value which it received from the system. You can return the I/O channel to the default status
by switching the power off and on again. This problem can be avoided by performing a complete download.
Binary Output (BO)
The binary output block is the logical image, or memory map, of a binary switch command and describes its
properties. Within the program it is made available to the block as a program value, and its parameters are
set via the "Polarity" pin. The block converts this program value and transfers the raw data to the physical
I/O, where it is converted into a digital signal, e.g., which drives the field device via a contact.
The following functions are integrated in the block:
● Evaluation of the priority array [PrioArr]
● Inversion of the switch value and the feedback value (Polarity of feedback [Bop])
● Interruption of the output signal [OoServ]
● Feedback monitoring (OFFNORMAL alarm)
● Reliability monitoring [Rlb] (FAULT alarm)
● Change of state messages (events / system events)
● Configurable switch types (Normal, Trigger, Pushbutton, Pushbutton with delay)
● Runtimes and monitoring periods
● Switch-command delays
● Process monitoring [StaFlg]
● Runtime totalization and maintenance messages
Feedback monitoring for dampers with one end switch
To monitor the damper position of dampers with one end switch, the switch position must be set by
defining the polarity of the feedback signal [Bop].