Manual

PoBlocks user manual (March 31, 2014)
35
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Remarks
None
16.48. Trigger / timing - Down counter
Description
Down counter decrements the counter on the Clock input positive (rising) changes
from value, specified by PV input, to 0
Inputs
Clock (Logic): Counter pulse signal
Load PV (Logic): When 1, counter value Value is loaded with value of PV
PV (32-bit integer): Initial counter value
Outputs
Q (Logic): Indicates whether counter has reached 0
Value (32-bit integer): Current counter value
Properties
Default value (Integer): Default reset value of the counter
Retain on reset (Logic): If True, the value is saved to battery-backed RAM. Also
disables default value setting.
Initial value (Integer): The initial value of the retained block after it gets uploaded to
the device.
Remarks
None
16.49. Trigger / timing - Up/down counter
Description
Up/down counter increments the counter vaue on the Clock up input positive (rising)
changes and decrements the counter on the Clock down input positive (rising)
changes. The counter value Value is limited to the range between (including) 0 to PV
Inputs
Clock up (Logic): Counter increasing pulse signal
Clock down (Logic): Counter decreasing pulse signal
Reset (Logic): When 1, resets the counter value Value to 0
Load PV (Logic): When 1, counter value Value is loaded with value of PV
PV (32-bit integer): Initial/maximum counter value
Outputs
QU (Logic): Indicates whether counter has reached maximum value
QD (Logic): Indicates whether counter has reached 0
Value (32-bit integer): Current counter value
Properties
Default value (Integer): Default reset value of the counter
Retain on reset (Logic): If True, the value is saved to battery-backed RAM. Also
disables default value setting.
Initial value (Integer): The initial value of the retained block after it gets uploaded to
the device.
Remarks
None
16.50. Trigger / timing - Pulse timer
Description
Pulse timer triggers on IN high input signal and turns off after the period defined by
PT, uneffected by the IN signal state during this period as illustrated below
Inputs
IN (Logic): Timer activation signal input