Operating Mode And Loops Enabled; Operating Mode; Loops Enabled - FACTS Engineering Direct Logic 405 Manual

Operating Mode and Loops Enabled

The Operating Mode and Loops Enabled location programs the operating mode and the number of loops
enabled for the module. The most significant byte selects the Operating Mode and the least significant
byte selects the number of Loops Enabled.

Operating Mode

There are four possible operating modes for all the enabled loops on the controller.
Normal A 0 in the high byte selects normal 160 msec per channel operation. For most
applications this provides the best trade off between speed and accuracy.
Slow A 1 in the high byte selects the slower 800 msec per channel conversion time but
provides the highest input stability and accuracy. If the PID Control Period (see page
2.20) is large (more than 4 seconds) then slow mode may be considered.
Fast A 2 in the high byte selects a faster 32 msec per channel conversion time. If fast mode
is selected, the resolution is reduced to ±2 EC. This mode is not recommended for PID
applications.
Ck Cal A 3 in the high byte selects the Check Thermocouple Calibration mode. This mode
disables the module's active burn-out detection circuit so that you can connect a
thermocouple calibrator to the module's temperature inputs.

Loops Enabled

Each Temperature Control loop uses 24 V-Memory locations of the Controller parameter table. The
number of consecutive loops enabled controls the size of the block of V-Memory used by each Controller
(24 to 96 words).
Example: For a Controller in slot 0, V7670=0103 will select slow Operating Mode with only three
loops enabled.
Controller in Slot 0, Slow Operating Mode, and 3 Loops Enabled.
INSTALLATION AND WIRING 2.9