Rockwell-automation 1760-xxxx Pico GFX-70 Controllers User Manual Uživatelský manuál stáhnout pdf (Strana 264)

Publication 1760-UM002B-EN-P - March 2005

4-154 Wiring with Pico GFX-70

Memory Requirement of the Value Limitation Function Block

The value limitation function block requires 40 bytes of memory plus 4 bytes

per constant on the function block input.

Function of the Value Limitation Function Block

The value is accepted at input VC...I1 if the enable coil is active. If the value is

greater than the upper limit value or less than the lower limit value, the

respective limit value is output at VC..QV.

Example with Timing Relay and Counter Function Block

A warning light flashes when the counter reaches 10. In the example, both

function blocks C 01 and T 01 are wired.

Figure 4.78 Hardwiring with relays

IMPORTANT

The function block must be enabled so that it can work.

Coil VC..EN is active. If coil VC..EN is not active, the

entire function block is deactivated and reset. The output

value is set to zero.

L01–

P1

P1

K1T

K1T

C

R

H1

S1

S2

L01+

2s

Counter

Value 10

1 2 ... 259 260 261 262 263 264 265 266 267 268 269 ... 399 400

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