Allen-Bradley GuardPLC 1753, Safety Reference Manual

Page: 33 / 120

Publication 1753-RM002C-EN-P - September 2008 33
GuardPLC Controller and GuardPLC I/O Module Input Channels Chapter 3
Analog Inputs
The items listed in the following section apply to all of the analog
input channels listed in the Overview on
page 28 , if no specific
module is named.
General
In the eight analog input channels available in each module, the
incoming signals are converted into an INTEGER value in 12-bit
resolution. This value can then be used in the application program.
The following input values are possible for the GuardPLC 1800
controller:
IMPORTANT
The safety-related accuracy is the guaranteed accuracy of the
analog input without error reaction of the module. This value
should be taken into account when the safety functions are
configured.
Input Values
Number of
Input Channels Polarity Current/Voltage Value Range In
Application
Accuracy
(5)
(5)
Accuracy is the guaranteed accuracy of the analog input without error reaction of the module. This value must
be considered when safety functions are configured.
8 single-ended 0…10V DC
0…1000
(1)
0…2000
(2)
(1)
With scale factor 1000 selected in RSLogix Guard PLUS! software.
(2)
With scale factor 2000 selected in RSLogix Guard PLUS! software.
2%
8 single-ended 0/4…20 mA
0…500
(1)(3)
0…1000
(1)(4)
0…1000
(2)(3)
0…2000
(2)(4)
(3)
By external 250
Ω
shunt.
(4)
By external 500
Ω
shunt.
2%
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