What are the types or brand of PLCs?

Boardly plc types are1.modular2.compact

according to sizing of plc they are classified as1.micro plc2.small plc3.medium plc4.large plc5.very large plc.

Brands of plcs are1.siemens plcs2.Abb plcs3.Allen Bradly plcs4.Mitsubishi plcs5.GE Fanu plc6.delta plc etc. 

Delta

simens

ge

abb

Schnider

ls

allan Bradley

mitsubishi

yokogawa

omron 

Honeywell

Foxboro

SIEMENS

OMRON

AB

ABB

SCHNEIDER

MITSUBISHI

GE-FANC

Honeywell

Programmable Logic Controllers are many types,,

SIEMENS

OMRON

AB

ABB

SCHNEIDER

MITSUBISHI

GE-FANC

Unitronics

KEYENCE

ROCKWELL AUTOMATION

Honeywell

there  are many brand of PLC s system 

 Honeywell

,Siemens,

Allen Bradley

,ABB

Mitsubushi

GE Fanuk

foxBoro A2

Plc's are also known as Pac's(Programmable Automation Controller)

1 Motion control.

2 process control.

3 Net work contrl.

4 Relay control.

and so on...

You can find so many PLC sysytems such as Honeywell,Yokogawa,Siemens,Allen Bradley,ABB,Mitsubushi and so many.

Yokogawa PLC named as PRO-SAFE  is used highly for safety purpose in industries.

I was confused then I googled, here what I find.

Programmable Logic Controllers (PLC) were originally invented for the U.S. automotive manufacturing industry to replace relay logic systems. The automotive industry adopted PLCs initially for software revisions, which replaced rewiring of control panels that were used during the changing of production models. Before PLC creation, the process to change and update facilities for its new models each year was very expensive and time-intensive since each relay had to be individually rewired. In1986, GM requested a proposal for a device that would electronically change this relay system. Winning this project bid, Dick Morely of Bedford Associates is known as the “father” of the PLC with their084 PLC as the first product of its kind. Bedford Associates founded the company Modicon to help promote and service its084 PLC, which was later sold to the German company now known as AEG. Schneider Electric in France is now the current owner of Modicon’s084 PLC.

with reference of http://plcbrands.com/

It is fairly easy to get information on the relative size of automation companies. Jim Pinto wrote a post in2012 on the top50 automation companies which used data from controlglobal.com’s2011 list. This placed Siemens at the top spot worldwide with other major PLC manufacturer’s as follows:

1. Siemens2. ABB4. Schneider (Modicon)5. Rockwell (Allen-Bradley)7. Mitsubishi8. GE11. Omron33. Bosch Rexroth35. Beckhoff37. Fuji47. Toshiba

Reference: http://automationprimer.com/2013/10/06/plc-manufacturer-rankings/

Mnay Manufacturers are in the race of manufacturing plcs.

Festo(old manufaturer)

Fatek

AB,

ABB,

Unitronics,

Mitshubhishi

Schnieder

SIEMENS

2-LG or LS

Allen bradley

Delta

B&R automation

FIREBRIDGE

TELKONET

There are diffrent types of PLC such as fixed PLC, Modular PLC, Rack type PLC

if you are asking about brands then there are lots of brands available for PLC's

like SIEMENS 

AB,

ABB,

Unitronics,

Mitshubhishi

Schnieder

& many more