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ControlLogix 7252 LDT Interface Manual
Revision 1.5
Chapter 2: HARDWARE OVERVIEW
Module Specifications
Current Draw: 400ma @ 5Vdc from PLC backplane
Throughput Time:
0.2ms to 1.2ms depending on channels used.
RPI Value:
0.5 to 28ms, with a recommended RPI time of 5ms.
External Power: The 7252 module requires the use of an ex24Vdc power supply that is used power the input
isolation circuitry and can also be used to power sensors that operate on 24Vdc
Voltage Range = +24V dc (± 20%)
Current Draw = 150mA. Add this amount to your LDT encoder’s current draw when sizing your
external 24Vdc power supply.
5Vdc supply
The 7252 module also uses the external power supply to generate a 5Vdc user power supply
that can be used to power encoders and or sensors that run on 5Vdc. This 5Vdc supply can
supply a maximum of 500mA (± 5%) of current.
Latching Inputs
The Latching Input terminals accept an up to 24VDC signal across pins 17-15, 18-16, The
latching function is performed as programmed when power is applied/removed, OFF to ON
and/or ON to OFF, to/from the input.
Voltage Range: 0 to 30Vdc
On State: 8 to 30Vdc
Off State: 0 to 2Vdc
Current Draw: 10mA @ 24Vdc
The latching inputs must be on for between 0.2ms and 1.2ms, depending on the number of
channels being used.
Environmental Conditions
Operating Temperature: 0 to 60° C
Relative Humidity: 5 to 95% (non-condensing)
Storage Temperature: -40 to 85° C
EDS File An EDS file for the 7252 module can be downloaded from the Tech Library section of AMCI’s website,
www.amci.com
.
FLASH Memory
The 7252 module’s parameter values are stored in a non-volatile Flash memory. This memory type can store parameter
values in the absence of power for over twenty years, but you can only write to it a limited number of times before it
will be damaged. The Flash Memory used in the 7252 module is guaranteed for a minimum of 10,000 write cycles.
