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Reference Manual
00809-0100-4696, Rev AA
September 2004
3-21
Rosemount 848L
Simulation
Simulation replaces the channel value coming from the transducer block for
testing purposes.
The following procedure is used to simulate a DI output.
To change the output value place the Target Mode of the block to Manual
and then change the OUT_D.VALUE to the desired value.
To simulate both the value and status do the following:
1. If the Simulate Switch is in the OFF position, move it to ON. If the
Simulate switch is already in the ON position, you must move it to Off
an place it back in to the ON position.
NOTE
As a safety measure, the switch must be reset every time power is interrupted
to the device in order to enable SIMULATE. This prevents a device that is
tested on the bench from getting installed in the process with SIMULATE still
active.
2. To change both the OUT_D.VALUE and OUT_D.STATUS of the DI
Block, set the TARGET MODE to AUTO.
3. Set SIMULATE_D.ENABLE_DISABLE to ‘Active’.
4. Enter the desired values for SIMULATE_D. SIMULATE_VALUE and
SIMULATE_D. SIMULATE_STATUS.
If errors occur when performing the above steps, be sure that the SIMULATE
switch has been reset after powering up the device.
DISCRETE OUTPUT
BLOCKS
The digital output blocks are used to receive a value from another device to
be used to either drive a contact output or to use in the logic equations. The
DO blocks make their values available to the 848L by placing the value in a
variable called DO (n) where n=1 to 8. Like the DI block, all eight outputs can
be communicated in a packed format by selecting the appropriate channel
number. The DO block does not drive the outputs directly but sets the state of
the internal variables DO(n). To drive an output from the DO block, the DO(n)
variable is placed in one of the output equations.
OUT1_EQ = DO(1);
MULTIPLE DISCRETE
INPUT BLOCK
The MDI block allows 8 values with their status in one block with 8 individual
outputs. The 8 values are selected by one of the “Array” channel numbers.
MULTIPLE DISCRETE
OUTPUT BLOCK
The MDO block allows 8 output values with their status in one block with 8
individual inputs. The 8 values are selected by the “Array Outputs” channel
number.