A-B 1746-P5 SLC 500 modular power supplies

Selecting Modular Processors 

SLC 500 modular processors are designed to meet a wide range of applications, 

from small stand-alone to large distributed systems and from simple to complex applications. 

Processor Features Memory size - The SLC 500 modular processors memory is user configurable for either data storage or program storage. 

Memory size is 1 K...64 K. I/O points - The SLC 5/01 processor supports addressing of up to 3940 I/O. 

The SLC 5/02, SLC 5/03, SLC 5/04, and SLC 5/05 processors support addressing of 4096 I/O. 

The SLC 500 modular processors are supported by over 60 different I/O modules including digital, analog, and intelligent I/O. 

Performance - The SLC 500 modular processors are designed with throughput performance in mind. 

The program scan time for a typical instruction mix are 0.9 ms/K...8.0 ms/K depending on the processor. 

I/O scan times are 0.25 ms...2.6 ms depending on the processor and I/O installed in the system. 

Advanced instruction support - The instructions available depends on the processor used. 

The following table lists the instructions supported by the SLC 500 modular processors.

Barrel Control

Select barrel control for multiple–zone applications in which there is

thermal conduction between the zones. Injection molding and

extrusion are good example applications because they use multiple

heater bands (zones) mounted on one thermal conductor (the metal

barrel). The barrel conducts heat between different zones. If you

select barrel control, also select between inner and outer zones (word

1, bit 13 for channel 1). A barrel loop is autotuned as the temperature

rises from a cold start to a temperature setpoint during startup.

Switching the barrel control

For some applications, even though the loops are independent with

no thermal conduction between zones, barrel control might provide

better performance than non–barrel control. If a loop has any of these

characteristics, you might want to use barrel control if the:

• time constant is greater than 10 - 30 seconds

• loop has a problem of overshooting the setpoint

• loop output is saturating (CV is at 100%) for a significant duration

Non–barrel control

Select non–barrel control for applications with independent loops and

no thermal conduction between zones. If you select non–barrel

control, the inner/outer zone selection doesn’t apply.

Installing and Wiring

This document gives you information about:

• avoiding electrostatic damage

• compliance with European Union directive

• determining the module’s chassis power requirement

• planning for sufficient enclosure depth

• choosing a module slot in a local I/O chassis

• installing the module

• wiring the module

TC Break Control

Word 4 or O:e.8 for Channel1

If a loop input circuit becomes open (open wire) the loop can not

measure temperature. In automatic mode, the lack of temperature

feedback makes it impossible to control the temperature. To guard

against this condition, the BTM module provides TC break detection.

When a break is detected, the module responds in one of these ways:

• disables the loop

• forces CV to this (TC Break Control) value (word 4 for loop 1)

• forces the CV to the manual %–output value (O:e.8 for loop 1)

Once the thermocouple break has been repaired you must disable the

loop and then re-enable it (through the input image table O:e.0/0 loop 1).