DL205 User Manual, 4th Edition, Rev. D
5-48
Chapter 5: Standard RLL Instructions
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Stage Counter (SGCNT)
The Stage Counter is a single-input counter that
increments when the input logic transitions from off
to on. This counter differs from other counters since
it will hold its current value until reset using the RST
instruction. The Stage Counter is designed for use in
RLL
PLUS
programs but can be used in relay ladder logic
programs. When the current value equals the preset value,
the counter status bit turns on and the counter continues
to count up to a maximum count of 9999. The maximum
value will be held until the counter is reset.
Instruction Specifications
Counter Reference (CTaaa): Specifies the counter number.
Preset Value (Bbbb): Constant value (K) or a V-memory location.(Pointer (P) for DL240,
DL250-1 and DL260.)
Current Values: Counter current values are accessed by referencing the associated V or CT
memory locations.* The V-memory location is the counter location + 1000. For example, the
counter current value for CT3 resides in V-memory location V1003.
Discrete Status Bit: The discrete status bit is accessed by referencing the associated CT memory
location. It will be on if the value is equal to or greater than the preset value. For example, the
discrete status bit for Counter 2 would be CT2.
NOTE: When using a counter inside a stage, the stage must be active for one scan before the input to the
counter makes a 0-1 transition. Otherwise, there is no real transition and the counter will not count.
NOTE: A V-memory preset is required only if the ladder program or an OIT must used to change the preset.
NOTE: * Both the Counter discrete status bits and the current value are accessed with the same data reference
with the HPP. DirectSOFT uses separate references, such as “CT2” for discrete status bit for Counter CT2,
and “CTA2” for the current value of Counter CT2.
Operand Data
Type
DL230 Range DL240 Range DL250-1 Range DL260 Range
B aaa bbb aaa bbb aaa bbb aaa bbb
Counters CT 0-77 0-177 0-177 0-377
V-memory for
preset values V
– 2000-2377 – 2000-3777 –
1400-7377
10000-17777
–
1400-7377
10000-37777
Pointers
(presets only) P
2000-3777
1400-7377
10000-17777
1400-7377
10000-37777
Constants
(presets only) K
– 0-9999 – 0-9999 – 0-9999 – 0-9999
Counter discrete
status bits CT/V
0-77 or V41140-41143 0-177 or V41140-41147 0-177 or V41140-41147 0-377 or V41140-41157
Counter current
values V/CT
1000-1077 1000-1177 1000-1177 1000-1377
CTaaa
SGCNT
B bbb
Preset
Counter #
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