Digital Inputs - Allen-Bradley Rockwell Automation 857 User Manual

6-2
Control Functions

Digital Inputs

857-UM001A-EN-P – July 2009
There are 1-32 digital inputs available for control purposes. The
polarity – normal open (NO) / normal closed (NC – and a delay can
be configured according the application. The signals are available for
the output matrix, block matrix, user's programmable logic etc.
The contacts connected to digital inputs DI1 ... DI6 must be dry
(potential free). These inputs use the common internal 48 Vdc
wetting voltage from terminal X3:1, only.
NOTE: These digital inputs must not be connected parallel with
inputs of another device.
Label and description texts can be edited with SetPointPS according
the application. Labels are the short parameter names used on the
local panel and descriptions are the longer names used by SetPointPS.
Table 6.2 – Parameters of Digital Inputs
Parameter Value
DI1 ... DI6 0
1
DI COUNTERS
DI1 ... DI6 0 ... 65535
DELAYS FOR DIGITAL INPUTS
DI1 ... DI6 0.00 ... 60.00
CONFIGURATION DI1 ... DI6
Inverted no
yes
Alarm display no
yes
On event On
Off
Off event On
Off
NAMES for DIGITAL INPUTS (editable with SetPointPS only)
Label String of max.
10 characters
Description String of max.
32 characters
Set = An editable parameter (password needed)
Unit Description
Status of digital input
(The actual number of digital inputs
depends on the ordering code)
Cumulative active edge counter
(The actual number of digital inputs
depends on the ordering code)
s Definite delay for both on and off
transitions
(The actual number of digital inputs
depends on the ordering code)
For normal open contacts (NO).
Active edge is 0⇒1
For normal closed contacts (NC)
Active edge is 1⇒0
No pop-up display
Alarm pop-up display is activated
at active DI edge
Active edge event enabled
Active edge event disabled
Inactive edge event enabled
Inactive edge event disabled
Short name for DIs on the local
display
Default is "DIn", n=1...32
Long name for DIs. Default is
"Digital input n", n=1...32
Set
(Set)
Set
Set
Set
Set
Set
Set
Set