Campbell CR10 PROM, Operator'S Manual

Page: 149 / 253

SECTION 9. INPUT/OUTPUT INSTRUCTIONS
9-17
If more channels are requested than exist in
one module, the datalogger automatically
increments the address and continues to the
next SW8A. The address settings for multiple
SW8A's must sequentially increase. For
example, assume 2 SW8A's with an address of
22 and 23 are connected, and 12 Reps are
requested. Eight channels from the first SW8A
and the first 4 channels from the second SW8A
will be read.
Only one Function Option (Parameter 3) may
be specified per P102 Instruction. If all 4
functions are desired, 4 P102 Instructions are
required.
Function Option 0 provides the state of the
signal at the time P102 is executed. A 1 or 0
corresponds to high or low states, respectively.
Function Option 1 provides signal duty cycle.
The result is the percentage of time the signal
is high during the sample interval.
Function Option 2 provides a count of the
number of positive transitions of the signal.
Function Option 3 provides the signature of the
SW8A PROM. A positive number (signature)
indicates the PROM and RAM are good, a zero
(0) indicates bad PROM, and a negative
number indicates bad RAM. Function Option 3
is not used routinely, but is helpful in
"debugging". Only one Rep is required for
Option 3.
Parameter 4 specifies the first SW8A channel
to be read (1..8). One or more sequential
channels are read depending on the Reps. To
optimize program efficiency, the sensors should
be wired sequentially.
Data are stored in sequential input locations,
starting at the location specified in Parameter 5.
The number of input locations consumed is
equal to the number of Reps.
The scaling multiplier and offset (Parameters 6
and 7) are applied to all readings. If a multiplier
is not entered, all readings are set to 0.
If the SW8A does not respond, -99999 will be
loaded into input locations. Modules which do
not respond when addressed by the datalogger
are possibly wired or addressed incorrectly.
Verify the address specified in Parameter 2
corresponds to the jumper setting and all
connections are correct and secure. See the
SDM-SW8 Manual for examples.
PARAM. DATA
NUMBER TYPE DESCRIPTION
01: 2 Number of Channels
02: 2 Module Address (00..33)
03: 2 Function Option
(0=State, 1=Duty,
2=Counts, 3=Signature)
04: 2 SDM-SW8A Starting
Channel (1..8)
05: 4 Starting input location
06: FP Mult
07: FP Offset
*** 103 SDM-AO4 ***
FUNCTION
Instruction 103 is used to activate a SDM-AO4
connected to ports C1, C2, and C3.
There are 4 analog voltage outputs per SDM-
AO4. The output voltages in millivolts must be
stored in 4 adjacent input locations starting with
the location entered in parameter 3. Four reps
are required for each SDM-A04. Every 4 reps
another device at the next higher address is
selected.
PARAM. DATA
NUMBER TYPE DESCRIPTION
01 2 Reps (# of outputs)
02 2 Address (Base 4)
03 4 Starting input location
C1 is Data line
C2 is Clk/Hand Shake line
C3 is SDE (Enable) line
*** 104 SDM-CD16AC ***
FUNCTION
The SDM-CD16AC Control Port Expansion
Module has 16 digital control ports with drivers.
Each port can be controlled by a datalogger or
controlled manually with an override toggle
switch. Each port can be thought of as a switch
to ground; closed when active, open when
inactive. The primary function is to activate AC
powered external relays, solenoids, or resistive
loads under datalogger control.
The SDM-CD16AC is a synchronously
addressed datalogger peripheral. Datalogger
control ports 1, 2 and 3 are used to address the
SDM-CD16AC then clock out the desired state