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counter as the new CV (current count value). The CTUD counter counts up or
down by 1 on the 0 to 1
transition of the count up (CU) or
count down (CD) inputs. The
CTUD timing diagram shows the
operation for an unsigned
integer count value (where PV =
4).
 If the value of parameter CV
is equal to or greater than the
value of parameter PV, then
the counter output parameter
QU = 1.
 If the value of parameter CV
is less than or equal to zero,
then the counter output
parameter QD = 1.
 If the value of parameter
LOAD changes from 0 to 1,
then the value at parameter
PV is loaded to the counter
as the new CV.
 If the value of the reset
parameter R is changes from
0 to 1, the current count
value is reset to 0. If a run mode session is ended with stop mode or a CPU power cycle and a new run mode
session is started, then the counter data stored in the previous run mode session is lost,
unless the counter data structure is specified as retentive (CTU, CTD, and CTUD counters). When you accept the defaults in the call options dialog after you place a counter instruction
in the program editor, you are automatically assigned an instance DB which cannot be made
retentive. To make your counter data retentive, you must either use a global DB or a Multiinstance
DB.This option works regardless of where the counter is placed (OB, FC, or FB).
1. Create a global DB:
– Double-click "Add new block" from the Project tree
– Click the data block (DB) icon
– For the Type, choose global DB
– If you want to be able to select individual items in this DB as retentive, be sure the
symbolic-access-only box is checked.
– Click OK
2. Add counter structure(s) to the DB:

In the new global DB, add a new static tag using one of the counter data types. Be
sure to consider the Type you want to use for your Preset and Count values.
Counter Data Type Counter Data Type Corresponding Type for the Preset and Count
Values
IEC_Counter INT
IEC_SCounter SINT
IEC_DCounter DINT
IEC_UCounter UINT
IEC_USCounter USINT
IEC_UDCounter UDINT
1. In the "Retain" column, check the box so that this structure will be retentive.
– Repeat this process to create structures for all the counters that you want to store in
this DB. You can either place each counter structure in a unique global DB, or you can
place multiple counter structures into the same global DB. You can also place other
static tags besides counters in this global DB. Placing multiple counter structures into
the same global DB allows you to reduce your overall number of blocks.
– Rename the counter structures if desired.
2. Open the program block for editing where you want to place a retentive counter (OB, FC,
or FB).
3. Place the counter instruction at the desired location. 4. When the call options dialog appears, click the cancel button. You should now see a new
counter instruction which has "???" both just above and just below the instruction name.
5. On the top of the new counter instruction, type the name (do not use the helper to
browse) of the global DB and counter structure that you created above (example:
"Data_block_3.Static_1"). This causes the corresponding preset and count value type to
be filled in (example: UInt for an IEC_UCounter structure).
Assign a multi-instance DB to store counter data as retentive data
This option only works if you place the counter in an FB.
This option depends upon whether the FB was created as symbolic access only. Once the
FB has been created, you cannot change the checkbox for "Symbolic access only"; it must
be chosen correctly when the FB is created, on the first screen after selecting "Add new
block" from the tree. To see how this box is configured for an existing FB, right-click on the
FB in the Project tree, choose properties, and then choose attributes.
If the FB was created with the "Symbolic access only" box checked:
1. Open the FB for edit.
2. Place the counter inst2. Place the counter instruction at the desired location in the FB.
3. When the Call options dialog appears, click on the Multi instance icon. The Multi Instance
option is only available if the instruction is being placed into an FB.
4. In the Call options dialog, rename the counter if desired.
5. Click OK. The counter instruction appears in the editor with type INT for the preset and
count values, and the IEC_COUNTER structure appears in the FB Interface under Static.
6. If desired, change the type in the counter instruction from INT to one of the other types.
The counter structure will change correspondingly.
Type shown in counter instruction (for preset
and count values)