Table of Contents
Advertisement
Chapter Objectives
General Description
Introducing Block I/O
In this chapter, you will learn what analog block I/O is, its features, and
how it functions.
Block I/O consists of small, self-contained remote I/O devices complete
with power supply, programmable controller interface, input/output
connections and signal conditioning circuitry. Table 1.A is a list of block
I/O modules covered in this publication.
Table 1.A
Types of Block I/O
Catalog Number
Power Supply Voltage
1791 N4V2
120V ac
1791 N4C2
120V ac
1791 NDV
24V dc
1791 NDC
24V dc
The analog blocks are compatible with PLC-2 , PLC-3 , PLC-5/250 and
PLC-5 family programmable controllers, and the SLC 5/02 (or greater)
modular controllers. Refer to the table below for information on using
block I/O with various Allen-Bradley programmable controllers.
If You are Using:
PLC 2 family programmable controller
PLC 3 family programmable controller
PLC 5 family programmable controller
PLC 5/250 programmable controller
SLC 500 programmable controller
The analog blocks communicate via block transfer or discrete transfer with
any Allen-Bradley programmable controller that connects to the remote
I/O network. The analog blocks communicate with SLC family controllers
using discrete transfer.
Each analog block has four independent inputs, which can be configured as
either all voltage inputs or all current inputs. The block contains a 24V dc
current limited voltage source for accommodating loop-powered current
transducer inputs.
1
Chapter
Inputs
Outputs
Description
4
2
analog - 4 input, 2 voltage output
4
2
analog - 4 input, 2 current output
4
2
analog - 4 input, 2 voltage output
4
2
analog - 4 input, 2 current output
You must use:
1771 SN sub I/O scanner or
1772 SD and SD2 remote I/O scanners
Block attaches directly to controller
y
1747 SN remote I/O scanner
1-1
Advertisement
Table of Contents
