Spectrum Controls 1771sc-IFE32 - Manual (Page 35)

Chapter 4: Configuring Your Module 25
max_scale = 1000
BCD
= 1000
16
If scaling is defined properly the min scale value is less than the max scale value
(scale
min
< scale
max
). If the min scale value is not less than the max scale value a
configuration fault is declared and scaling is not applied.
*If min = max = 0 then scaling is disabled. This is the default configuration.
Scale Scale Scale Scale Scale W W W W Wor or or or ord Configuration Bits d Configuration Bits d Configuration Bits d Configuration Bits d Configuration Bits
Word/Bit 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 Group
0 Channel 1 Min Scale Min Scale
1 Channel 1 Max Scale Max Scale
62 Channel 32 Min Scale Min Scale
63 Channel 32 Max Scale Max Scale
If differential mode is used every other channel scale group is skipped. For example,
when channel 1 is used in differential mode Scale Word 0 (Min Scale) and Word 1
(Max Scale) are used. Word 2 and Word 3 are skipped. Word 4 and Word 5 are Min
and Max Scale words for channel 2, etc.
Scaling: *Default:
Min Scale Value (Binary) 0
Max Scale Value (Binary) 0
Important:
If scaling is selected for any channel, all channels must be scaled. If scaling is not
required on certain channels, set those to the default input range: 0 to 4095 for 0 to +
voltage or current ranges, and -4095 to +4095 for - to + voltage or current ranges.
If scaling is not selected, the module BTR file length will be 23.
Important: Use decimally addressed bit locations for PLC-5 processors.
The module will return values outside the scaling range. For example, if a module is in
the 0–5V dc mode, scaled for 0 to 5000, and has –2V dc applied, it will return –2000.
Default Configuration: Default Configuration: Default Configuration: Default Configuration: Default Configuration:
If a write block of five words, with all zeroes, is sent to the Analog Input Module (cat.
no. 1771sc-IFE32), default selections will be:
· 1 to 5V dc or 4 to 20mA (dependent on configuration jumper setting)
· BCD data format
· no real time sampling (RTS)