Zoom register layout – Spectrum Controls 140 EHC 204 00sc User Manual
Page 28
Counter / Flow Meter Input Module
29
Zoom Register Layout
The following table shows the layout for each of the zoom registers. The 8 channel module uses this layout for
the first eight registers. The four channel uses the first 4 zoom registers. (The nineth - 8 channel or 5th - channel
zoom register specifies the Bank Switch Period in the Autosequence Mode.) , with bit 1 the MSB and bit 16 the
LSB.
Table 3-3 Bit Settings for Zoom Registers
Function
1
2
3
4
5
6
7
8
9
10
11 12 13 14
15 16
Input range*
5V **
0
0
12V
0
1
24V
1
0
AC
1
1
Count mode*
Unidirectional **
0
0
Bidirectional
0
1
Quad. 1X
1
0
Quad. 4X
1
1
30kHz filter
Disabled **
0
Enabled
1
15 kHz filter
Disabled **
0
Enabled
1
Count size
65K **
0
16M
1
Rate Scale
1.0Hz
0
0.1Hz
1
Unused
X
X
X
X
X
X
X
X
* Channel Pairs (1-2, 3-4, 5-6, 7-8) must be configured the same to operate properly.
** Default Settings
Input Range, Bits 15 and 16
These bits select one of the four available input ranges: 5V, 12V, 24V and AC. Select the range that is closest to
the maximum amplitude of your device signal. For example: If your flow meter has a peak signal amplitude of
20 volts, select the 24V input range. Each range selection determines the counter trip level. Matching the input
range to your signal amplitude will miximize false counting.
NOTE: Allow at least one scan time for input range information to be updated at the PLC.
NOTE: Channel pairs (1-2, 3-4, 5-6, 7-8) must be configured with identical input ranges to function properly.
Count Mode, Bits 13 and 14
The count mode bits select the type of input operation. Possible types are:
•
Unidirectional
•
Bidirectional
•
Quadrature 1X
•
Quadrature 4X