What is Interposing Relay in a PLC System ?
Interposing Relay is the auxiliary relay which is used to isolate the two different systems / devices. This could be because they
PLC Valve Control Ladder Logic Programming
Objective : To understand the basic concept of PLC Valve Control Ladder Logic. Target Users : Students, Technicians, Freshers, Trainee
PLC Analog Input Scaling
An Allen-Bradley SLC500 programmable logic controller (PLC) uses a 16-bit analog-to-digital converter ( in its model 1746-NI4 ) in analog
Mis-conceptions of PLC Ladder Logic
Perhaps the most important yet elusive concept to grasp when learning to program PLCs is the relationship between the electrical
PLC Input Output Modules
Every programmable logic controller must have some means of receiving and interpreting signals from real-world sensors such as switches, and
PLC Digital Input and Digital Output Modules
A “discrete” data point is one with only two states on and off. Process switches, push-button switches, limit switches, and
Contacts and Coils in PLC Ladder Logic
The most elementary objects in Ladder Diagram programming are contacts and coils, intended to mimic the contacts and coils of
Motor Trip Logic using PLC Programming
Programmable Logic Controller (PLC) Questions and Answers This PLC is being used to start and stop an electric motor, and
PLC Program for Motor Starter
PLC tutorial explaining step by step procedure to program PLC for motor starter. Motor starters are of many types however
PLC Pump Permissive Interlocks
The following PLC program was written to control the operation of a large electric motor-driven pump. A variety of “permissive”