User manual

Publication LOGIX-AP010B-EN-P - May 2010 117
Drive and Loop Control Chapter 7
S5 Analog Control Modules
S5 has a number of intelligent I/O modules dedicated to the control of analog
signals.
IP 243 Analog Module
This module is used for the quick processing of analog input signals. It has
eight high-speed analog input channels with a maximum conversion time of 35
µs. It includes two comparators that allow the comparison of analog values
with each other. It is generally used in process control applications where the
use of standard analog input and output modules would be too slow to provide
the required response.
IP 244 Temperature Controller Module
This module is used for closed-loop PID temperature control and limit
monitoring of analog signals. There are 16 analog input channels, 12 of which
are configured for thermocouples. The manipulated variables are output in
binary form by using pulse width modulation.
IP 252 Closed Loop Control Module
This module can be configured for dedicated fast control loop applications in
the S5 system. It has eight analog inputs and eight analog outputs. It can
execute eight closed-loop applications in parallel. Because it processes these
loops internally, it does not draw on the S5 CPU resources. However, it is
possible to transfer data between the CPU and the IP 252. It also has inputs
for two tachogenerators whose pulse trains can be processed by the IP 252 to
evaluate actual motor speed.
IP 260 Loop Controller Module
This is a single-channel loop controller that is used in the control of process
variables such as temperature, pressure, and flow. All the process variables
required for closed-loop control are acquired via the four analog input
channels.
PID control is performed on the process signal and the resultant-calculated
manipulated variable is output to the process via two digital controller outputs
or via the analog output, depending on the controller type.