MEB Options
2-D/A MEB
Each pulse input has a seven-position DIP configuration switch to select
the mode of operation. The function of each switch position in the ON
position is listed in the following table.
Table 4–16. Switch functions (when in the ON position) for the 2-PI MEB
Switch Position
Function
1
Conditioning amplifier input
2
Conditioning amplifier input bypass
3
5 Vdc pull-up (2.5 mA maximum)
4
5 Vdc pull-up (0.1 mA maximum)
5
Conditioning amplifier output
6
Conditioning amplifier output bypass
7
Debounce, 400 Hz maximum input filter
Warning
Do not change switch settings unless the area is known to be
non-hazardous.
Typical configuration switch settings for various inputs are shown below.
Table 4–17. Typical switch configurations for the 2-PI MEB
Input Type
Switch Positions Set to ON
Slot sensor
2, 3, 6
Magnetic
1, 5
Contact closure
2, 4, 6, 7
The 2-D/A MEB provides two 4–20 mA output currents under software
control. Up to four 2-D/A MEBs can be installed in each unit. A jumper
may be installed at J5 positions 1 and 2 for a 12 V output when powered
from a 12 V input power source (used to drive total loop resistance of 300
ohms or less). Alternatively, the 2-D/A MEB may also be assembled with
the D/A power board mounted at J5 to provide a 24 V maximum output
(used to drive total loop resistance from 250 to 750 ohms).
The +24 V output from the optional 12/24 Vdc converter board can be
used as input power to the 2-D/A MEB to provide a 24 V output without
the D/A power board. One current loop output signal is connected at
TB3-2, with the current loop reference connected to TB3-3. The second
current loop output signal is connected at TB3-4, with the reference
connected to TB3-3. If the +24 V input power option is used, it is
connected at TB1-2 with the input power reference connected to TB1-1
and the J5 jumper installed between positions 1 and 2.
Switch
Configurations
2-D/A MEB
Thermo Fisher Scientific
AutoPILOT PRO Flow Computer User Guide 4-15
