Analog Device Restrictions — Power Supplies
Power requirements and hardware restrictions limit the number and
placement of analog devices on I/O expansion boards.
The allowable number of analog devices the 9700 Power Meter can support
increases significantly when two external power supplies are used to power
the expansion boards. The default configuration of Expansion Board A does
not include a power supply; it has to be purchased separately. If Expansion
Board A is powered directly from the 9700 Power Meter, then a maximum of
six analog devices can be installed on it. (A separate power supply is
required for Expansion Board B in any configuration.)
To use the maximum number of analog I/O devices, two power supplies
must be used (one for each expansion board). Note that if a separate power
supply is used with Expansion Board A, then the jumper must be removed
from the board. Failure to remove the jumper will void the 9700 Power
Meter’s warranty. (Refer to the
9700 Power Meter Installation & Basic SetupInstructions
for jumper location.)
Analog Device Restrictions — Direction (Input or Output)
The direction of all of the devices in slots 0 through 7 and slots 8 through 14
must be the same. You cannot mix inputs and outputs within these two
groups of slots; however, you can have all inputs in slots 0 through 7, and
all outputs in slots 8 through 14 (or vice versa).
As noted on the graphic above, only slots 8 through 14 support analog input
devices, thereby limiting the maximum number of these devices to seven
per board. Analog Output devices can populate both slot groups on the
expansion board, so a maximum of 15 of these devices can be used per
board.
If Expansion Board A is used without a separate power supply, only six
analog devices can be used in total, regardless of direction restrictions.
The following table summarizes the restrictions on analog I/O devices.
Max # of
Analog
Inputs
Max # of
Analog
Outputs
Max # of
Analog
Devices
Possible
Maximum
Configurations
Board A WITHOUT Optional
Power Supply (default
configuration)
6 6 6 Any combination up to 6 total
Board A WITH Optional Power
Supply 71515Board full
Board A WITHOUT Optional
Power Supply (default
configuration) + Board B
13 21 21 A: 6 AI; B: 7 AI, 8 AO
A: 6 AO; B: 7 AI, 8 AO
A: 6 AO; B: 15 AO
A: 6 AI; B: 15 AO
Board A WITH Optional Power
Supply + Board B 14 30 30 Both boards full