The topic of PACs and PLCs + other controllers, covers a large range of product type as seen below.

 Hardened Computer based PAC Systems - OS Win CE or Linux  
 Intel based hardened computers with I/O - Win CE or Linux  Sealevel Systems, Advantech, Contec
 Arm 9 based hardened computers with I/O  Sealevel Systems, Artila
   
 PACs Systems - No OS  
 PAC Systems hardened Ethernet or Wireless  Opto 22
 PAC Systems huge range of PAC IO modules  Opto 22
 PAC Systems Advanced multitasking software  Opto 22
   
 Distributed I/O Systems OS Win CE or Linux  
 Distributed I/O :- Using a PC as the PAC controller  Opto 22, Sealevel
 Distributed I/O :- Extensions for Allen Bradley PLCs  Opto 22
 Distributed I/O :- Network Controller - hardened ethernet  Opto 22, Sealevel Systems, Advantech
 Distributed I/O :- PC Based - hardened ethernet  Opto 22
 Distributed I/O :- PC Based - hardened 4 wire RS-485  Opto 22
 Distributed I/O :- PC Based - Soft-Logic with Computer I/O  Opto 22, Sealevel Systems, ADlink, Advantech, Artila
 Distributed I/O :- Soft Logic - External ADAM RS-232/485 I/O modules  Advantech, ADlink, Dataforth, ICS, Opto 22
 Distributed I/O :- Profibus and Foundation Fieldbus  Opto 22, Micronor
 Distributed I/O :- DeviceNet and CANbus  Opto 22, Micronor, Axiomatic
 Distributed I/O :- PC based Ethernet Modbus, USB, RS-232, RS-485
Analog and Digital I/O + Relays and SSRs
 Sealevel Systems, Opto 22
Distributed I/O :- USB and Ethernet I/O modules  Sealevel Systems, Measurement Computing, LabJack, Eagle
Distributed I/O :- AC & DC Power Control  Opto 22
   
PID Controllers - No OS  
PID Controllers (huge range lowest cost performance)  Jumo, Omega
   
 PLCs - No OS  
 PLCs - Siemens Equivalent with HMIs ad Scada  VIPA
 PLCs - Siemens & Allen Bradley Equivalent PLCs  Automation Warehouse
 PLCs - Board level - Basic like Programming  Splat
 PLCs - Tiny Basic DIN - Function Block Programming  Array, Omega
 PLCs - Smarter Tiny DIN - Function Block Programming  Array
 PLCs - Advanced Tiny DIN - Function Block Programming  Array
   
 PLCs - OS Linux or COS Realtime  
 PLCs - Board and box level - ARM 9 - Linux based - C Programming  Artila
 PLCs - Micro Controller - COS multitasker based - C Programming  Rabbit Semi
 PLCs - Micro Controller - C Programming  Micromint


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