The named counter fields

Each named counter consists of the counter name, the current value, the minimum value, and the maximum value.

The counter name
The name can be up to 16 bytes, comprising the characters A through Z, 0 through 9, $ @ # and _. Names less than 16 bytes should be padded with trailing blanks.
The current value
The next number to be assigned to a requesting application program.
The minimum value
Specifies the minimum number for a counter, and the number to which a counter is reset by the server in response to a REWIND command.
The maximum value
Specifies the maximum number that can be assigned by a counter, after which the counter must be explicitly reset by a REWIND command (or automatically by the WRAP option).
All values are stored internally as 8-byte (doubleword) binary numbers. The EXEC CICS® interface allows you to use them as either fullword signed binary numbers or doubleword unsigned binary numbers. This can give rise to overflow conditions if you define a named counter using the doubleword command (see Using the named counter EXEC interface) and request numbers from the server using the signed fullword version of the command.