Modicon

Quantum Automation Series 140 CPU 534 14A 

Instruction Sheet

31002658 02 Version 3.0

Important Information

What is an “A” 

Version CPU 

The obsolescence of parts has necessitated a redesign of the Quantum 

Automation Series 140 CPU 534 14 controller. This redesigned version 

of the controller will be designated with “A” at the end of the part number 

(i.e., 140 CPU 534 14A). This version is functionally identical to the standard 

version (non-”A”), however, the following should be considered.

If you are using the module in a hot standby topology, then you must use either 

two non-”A” models or two “A” models.

The “A” version has a unique flash executive.

Note: The “A” and non-”A” flash executives are not interchangeable.

Schneider Automation software (Concept, ProWORX, and Modsoft) supports 

the “A” version. Any existing or new 140 CPU 534 14 program configuration 

will load into a 140 CPU 534 14A without any modifications.

For More 

Information

For complete information concerning this and other modules, please obtain a copy 

of the Quantum Automation Series Hardware Reference Guide (840 USE 100 00) 

from your distributor or local sales office.

Front Panel Topology

Overview of the 

Front Panel 

Switches

There are two switches (a three-position slide switch and a three-position key 

switch) and one connector (Modbus RS-232) located on the front of the CPU. 

These switches are described in the following sections.

Front Panel Slide 

Switch

The slide switch is used to select the comm parameter settings for the Modbus 

(RS-232) ports. Three options are available.

Setting the slide switch to the top position assigns ASCII functionality to the 

port; the following comm parameters are set and cannot be changed.

ASCII Comm Port Parameters

Baud 2,400

Parity Even

Data Bits 7

Stop Bits 1

Device Address Rear panel rotary switch setting

Front Panel Topology, continued

Front Panel Slide 

Switch, continued

Setting the slide switch to the middle position assigns remote terminal unit 

(RTU) functionality to the port; the following comm parameters are set and 

cannot be changed.

Setting the slide switch to the bottom position gives you the ability to assign 

comm parameters to the port in software; the following parameters are valid.

RTU Comm Port Parameters

Baud 9,600

Parity Even

Data Bits 8

Stop Bits 1

Device Address Rear panel rotary 

switch setting

Valid Comm Port Parameters

Baud 19,200 1,200

9,600 600

7,200 300

4,800 150

3,600 134.5

2,400 110

2,000 75

1,800 50

Data Bits 7 / 8

Stop Bits 1 / 2

Parity Enable/Disable 

Odd/Even

Device Address 1 … 247

Front Panel Topology, continued

Front Panel Key 

Switch

The key switch is used to protect memory from programming changes while the 

controller is in operation.

Front Panel Topology, continued

Front Panel 

Modbus 

Connector

The Quantum 140 CPU 534 14A is equipped with two nine-pin RS-232C 

connectors that support Modicon’s proprietary Modbus communication protocol. 

The following is the Modbus port pinout connections for nine-pin and 25-pin 

connections.

Note: Although the Modbus ports electrically support existing Modbus cables, it is 

recommended that a Modbus programming cable (Part # 990 NAA 263 20) be 

used. This cable has been designed to fit under the door of a Quantum CPU or 

NOM module..

Rear Panel Topology

Overview of the 

Rear Panel 

Switches

Two rotary switches (refer to the illustration and table below) are located on the rear 

panel of the CPU. They are used for setting Modbus Plus node and Modbus port 

addresses.

Note: The highest address that may be set with these switches is 64..

SW1 (the top switch) sets the upper digit (tens) of the address; SW2 (the bottom 

switch) sets the lower digit (ones) of the address. The illustration below shows the 

correct setting for an example address of 11.

Note: If 0″ or an address greater than 64 is selected, the Modbus + LED will be 

“ON” steady, to indicate the selection of an invalid address..

Option Module Interface Support

Overview The 140 CPU 534 14A supports up to six network modules (i.e., Modbus Plus, 

Ethernet, and Multi-Axis Motion option modules) using the option module interface 

technique. However, only two Modbus Plus modules can have full functionality, 

including Quantum DIO support. 

Quantum 

Communications 

and Network 

Modules

The following table lists the Quantum communications and networking modules.

Option Module Interface Support, continued

Quantum 

Communications 

and Network 

Modules, 

continued

Option Module Interface Support, continued

Quantum 

Modbus and 

Modbus Plus 

Services

 This table describes the types of services provided by Modbus and Modbus Plus.

Option Module Interface Support, continued

Quantum 

Modbus and 

Modbus Plus 

Services, 

continued

!40 CPU 534 14A Module Specifications

140 CPU 534 14A 

Specifications

The following table provides you with the specifications for the 140 CPU 534 14 

module.

!40 CPU 534 14A Module Specifications, continued

140 CPU 534 14A 

Specifications, 

continued

Maximum Number of Option Module Interfaces 6

Watchdog Timer 250 ms (S/W adjustable)

Logic Solve Time 0.1 ms / k to 0.5 ms / k

Battery 3 V Lithium

Service Life 1200 mAh

Shelf Life 10 years with 0.5% loss of capacity per year

Battery Load Current @ Power-off

Typical 14 microamps

Maximum 420 microamps

Communication

Modbus (RS-232) 2 serial ports (9-pin D-shell)

Modbus Plus (RS-485) 1 network port (9-pin D-shell)

Programming Software Compatability Modsoft Ver. 2.6 

Concept Ver. 2.1 with B2.1 patch exec

Concept Ver 2.2 with SR2

ProWORX NxT Ver. 2.0

ProWORX Plus Ver. 1.05

General

Diagnostics Power Up

RAM

RAM Address

Executive 

Checksum

User Logic 

Check

Processor

Runtime

RAM

RAM Address

Executive Checksum

User Logic Check

Bus Current Required 1.25 A

TOD Clock +/- 8.0 seconds/day 0 … 60° C

Operating Temperature 0 … 50° C

Maximum Number of NOM, NOE, and MMS Modules

(any combination)

6