S5 AWL Command: ZV (Count Up)

ZV increments a counter by 1 on each rising edge of the VKE. The counter value is stored in BCD format with a range of 0–999.

Syntax#

U   E 0.0          // Count pulse input
ZV  Z n            // Increment counter n

To set a preset value:

U   E 0.1          // Set condition
L   KZ 050         // Preset value = 50
S   Z 1            // Set counter Z1 to 50

S7 Equivalent#

Code Example — Parts Counter#

U   E 0.0          // Sensor detects part
ZV  Z 1            // Count up

U   E 0.1          // Reset button
L   KZ 000         // Preset = 0
S   Z 1            // Reset counter to 0

L   Z 1            // Load current count value into ACCU1
T   MW 10          // Store count in MW10 for display

Reading Counter Values#

• U Z n — Tests if counter > 0 (boolean: TRUE if count ≥ 1)
• L Z n — Loads the current BCD count value into ACCU1

Related: ZR (Count Down)#

Part of the S5 AWL Command Reference. Maintained by PLCcheck.ai.

Analyze Your S5 Code Automatically#

PLCcheck Pro reads your complete S5 AWL program and explains every instruction — including this one — in plain language. Upload your code and get instant documentation, S7 equivalents, and migration guidance.

Upload S5 code for free analysis → | S5→S7 Migration Guide →