Design and Implementation of HC900 Control System - Allowable Function Blocks for Process and Safety Functions
42 HC900 Process & Safety Controller Safety Manual Revision 1.9
01/14
Connector
Combines with the signal tag or page connector to
route a signal between points anywhere in the
Function Block diagram without having to draw a
softwire between them. Connectors may only be
connected to function block inputs. Signal tags or
page connectors supported may be analog or digital.
X
X
Signal Tag
Signal tags are user-assigned names that can be
associated with the output of any item. They can be
assigned to displays; used to connect discontinuous
wires to other block inputs using connectors in the
same or in another FBD Worksheet; assigned to Data
Storage; used for Peer-to-Peer communication
between multiple-networked controllers using Modbus
communications. To identify important block output
pins for monitoring.
X
X
Page Connector
A Page Connector lets you connect a signal from a
worksheet page to another page and across
worksheets. Page connectors are similar to signal
tags except they do not appear in any signal tag lists.
They are tags but they have no descriptors, decimal
places, or alarm/event notification properties. You can
rename them. Page connectors can be monitored.
The Watch Summary window has a tab for page
connectors.
X
X
The following are the validation IO function blocks which are available for the process and safety configuration of
HC900 controller configuration.
•
Analog Input Voting Function Block (AI-V)
The common analog input voting function block is connected to any combination of three input channels.
Up to three input channels may be connected to the source; the function block output pin reflects the first
channel that agrees within 3% of the other valid enabled channel.
Figure 7 – Analog Input Voting Block
•
Analog Output Validation Function Block (AO-V)
The analog input selected is compared to the AO channel output value for verification of output.
To Next Page
Loading...
