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AM16/32B Relay Analog Multiplexer

Reset

Clk

5ms (+-2ms)

To Enter B

Address M ode

Enters B addressing

mode

(0 - 100ms) Note: if > 100ms the B Address mode

is Aborted. Also, Abort can happen if > 100m s

time between Clk's

Address=Chan 3

Chan 3 Selected

(Relays make contact)

Advance to Chan 4

(Relays m akes c ontact)

Note: if the B mode is aborted,

then this event would select

Mux Chan 1

> 1 m s

(0 – 75 ms) Note: if > 125 ms the B Address mode

is Aborted. Also, Abort can happen if > 125 ms

time between Clk’s.

5 ms (±1 ms)

To Enter B

Address Mode

FIGURE 4. Diagram Showing Advancement of Channels using Clocking Mode B

4.1.2.3 Datalogger Connection/Instruction

With the 21X and CR7 dataloggers, switched excitation is generally used to

clock the multiplexer (Instruction 22 configured for 5000 mV excitation). If

no switched excitation channel is available, it is possible to clock using control

ports. See Section 5.1 for details.

In the case of the CR5000, CR3000, CR800, CR850, CR1000, CR23X, and

CR10(X), a control port is generally used to clock the multiplexer. Instruction

86 with the pulse port option (command code 71 through 78) generates a 10 ms

pulse which works well.

The CR5000, CR3000, CR800, CR850, and CR1000 uses a control port

controlled by PortSet, Delay, and SubScan/NextSubScan to create the Clock

pulses (see program example in Section 5.3).

If several multiplexers are required, a CR5000, CR3000, CR800, CR850,

CR1000, CR10(X) or CR23X control port can source sufficient current to

drive up to six AM16/32B CLK or RES inputs wired in parallel.

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 49 50

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Campbell AVW1 Especificaciones Pagina 14