Counter accumulators on a DL260 CPU are mapped to V-memory: CTA0 sits at V1000. Point the C-more numeric display at that PLC address, not at a tag name, and take every other counter's address from the memory map in chapter 3 of the DL205 User Manual. Then verify the panel against the live count in the PLC software.
On a DL260 CPU, the counter accumulator is not a tag you can browse to; it is a V-memory address. The counter accumulator table starts at V1000, and V1000 is CTA0. Point your C-more numeric display's PLC address at V1000 and it shows the accumulated count of counter 0, live. For any other counter, take the address from the memory map in chapter 3 of the DL205 User Manual, because each counter has its own entry. The job breaks into four moves: read the counter number off the ladder, look up its address, put that address in the display, then check the read against the live value in the PLC software.
Why there is no accumulator tag to find
The up/down counter instruction in your ladder keeps its accumulated value in a V-memory location fixed by the CPU's memory map. The C-more panel reads PLC data by address through its configured connection, so the display wants the address of that location. CTA0 is a label in your program, and a tag search for an accumulator finds nothing because the name lives in the ladder, not in the data the driver reads. The fix is the same discipline as setting an HMI tag device and PLC address without guessing: get the address right and the object works.
What you need
- The counter number, read off the up/down counter instruction in the ladder. This walkthrough uses
CTA0. - The DL205 User Manual, chapter 3, open at the counter accumulator table. Its data types and memory map appendix lists V-memory addresses by memory type, and it tells you to confirm the ranges for your particular CPU model.
- A C-more project with a working connection to the DL260. If other objects on the screen already show live data, the connection is good.
- A numeric display object on the screen where the operator reads the count.
Point the display at the accumulator address
- Open the ladder and write the counter number down exactly as the instruction prints it:
CTA0here. - Find that counter in the memory map. Chapter 3 of the DL205 User Manual holds the table, and its first entry is
V1000=CTA0. Read the address for your counter from the table; do not step the address by guess to reach another counter. - Add a numeric display object to the screen.
- Set the object's data source to the DL260 connection the rest of the screen uses.
- Enter
V1000as the PLC address. If the address field refuses the notation, open the driver's address-entry help and choose the V-memory device exactly as it is printed there. An address from a different device type can be accepted and still read the wrong data. - Format the object as a plain integer with digits wide enough for the counter's largest expected count.
- Download the project to the panel with your site's normal change procedure.
Example: CTA0 at V1000, verified at the machine
Inputs:
- CPU: DL260. Panel: EA7-T10C. Counter:
CTA0, an up/down counter in the ladder. - Address:
V1000, from the counter accumulator table in chapter 3 of the DL205 User Manual. - Reading position: the operator stands 6 ft from the panel.
The rule in words: the numeric display shows whatever the DL260 holds at V1000, and the counter instruction updates that location on every count, so the display tracks the accumulator once the address is right.
Digit size. The planning figure is 1 in of capital height per 30 ft of viewing distance, from the FHWA letter-height basis, so 6 ft needs 6 / 30 = 0.2 in digits. Fast reading uses the safer figure of 20 ft per inch: 6 / 20 = 0.3 in. Set the digits at 0.5 in and both figures are beaten with room to spare.
The read. In the PLC programming software the accumulator shows 127. Jog the count input 10 times: 127 + 10 = 137. The panel must read 137 at the same moment.
The reset. Trip the counter reset, and the panel must show the reset value your logic writes.
Decision: both values move together through the 10 counts and the reset lands where the logic puts it, so the address is right and the job is done. Any disagreement stops the job at the address, not at the ladder.
Check the read before you change anything
- Match count for count against the PLC software while the counter runs. Ten counts must move both by ten.
- A display that shows nothing at all is an address problem first; that is the same failure as an HMI numeric display that shows nothing until its tag address is checked.
- A number that never moves is a connection problem. A PLC heartbeat counter verified from the panel settles that question in one glance.
- A number that moves with the count but looks wrong, huge or garbled, is a data-format problem on the display. That is the same class of mismatch as a scale value that differs from the PLC analog input: fix the format on the panel, leave the ladder alone.
- No preset, reset coil or count input belongs in this job. A counter that fails to count in the PLC software is a logic problem; a counter that counts in the software but not on the panel is a display problem.
A count board for the whole floor
The EA7 panel answers the operator at the machine. When the number also has to reach a supervisor across a cell, put the supporting material on a separate screen built for reading at distance: our shop-floor status displays play shows from their own memory card or USB stick and do not read PLC tags, so the live count stays on the panel and the board carries the shift target, the plan and the notices.
The decision
Recommendation: use V1000 for CTA0 on a DL260, and read the address for every other counter from chapter 3 of the DL205 User Manual before you point a display at it. If the panel tracks the PLC software count for count, the setup is finished and you change nothing in the ladder. If the display is blank, fix the address; if it is frozen, fix the connection; if it counts but shows a nonsense number, fix the display's data format. The ladder is the last place this job ever goes.
Questions
Is V1000 the address for every counter on a DL260?
No. V1000 is CTA0, the first entry in the counter accumulator table. Each counter has its own address, so read yours from the memory map in chapter 3 of the DL205 User Manual instead of stepping the address by guess.
Can I enter the counter name CTA0 as the display address?
No. The name is either rejected or lands as a plain text label, and the object reads nothing. There is also a trap to check even with a numeric address: the driver's address-entry help can list a counter current-value device and a V-memory device side by side, and an address that fits both numbering schemes reads different data depending on which device you pick. Choose the V-memory device, then enter V1000.
The display shows a value that never changes. Is the counter logic faulty?
Check the read before the logic. Compare the panel with the live accumulator in the PLC software while you jog the count input. A static display points to the address or the connection; the counter is only suspect when the PLC software itself stops counting.
Do other DL205 CPUs use the same accumulator addresses?
The memory map belongs to the CPU model. The V1000 equals CTA0 starting point comes from the DL205 manual, and the manual tells you to confirm the ranges for your particular model. Check the table for your CPU before reusing the address on another chassis.
Planning information, not legal or engineering advice. Rules differ by place: check codes and permits with your local authority and your licensed trades.