Rockwell Automation 61C544A RTD Module User Manual

Page 34

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4Ć18

The RTD module is connected to a4Ćwire RTD in this example. Three

vats of solution are being monitored for the following temperatures:
D High High Alarm = 250_C
D High Alarm = 200_C
D Low Alarm = 100_C
D Low Low Alarm = 50_C.
The sample program uses the following memory locations:
Bit 00.00

= Bit to be set by the user when achannel is to be

configured.

Bit 1700.00 = Bit used to detect the rising edge of Bit 00.00.
Register 10 = Register contains the coils corresponding to the

status of the RTD High High alarms.

status of the RTD High alarms.

status of the RTD Low alarms.

status of the RTD Low Low alarms.

Register 1600= Internal coils
Register 1601= Internal coils
Register 1610= The register's bits are used to indicate the status of

operation.
Bit .00 represents state 0 which writes the READY

command to the RTD module and then reads the

module's configuration status. If the complete bit of

the configuration status register is equal to zero,

advance to state 1.
Bit .01 represents state 1 which reads channel

configuration data from the AutoMate's memory and

writes out to the RTD module. State 1 then reads the

RTD module's configuration status. If the

configuration is complete and there are no errors,

go to state 2.
Bit .02 represents state 2. This state directs the

program to continue with the configuration of the

next channel (state 0), provided no errors have

been detected.
Bit .16 is set when an error is detected and the

configure operation is aborted.
Bit .17 is set when all of the RTD channels have

been configured.

contains the contents of the RTD Configuration

Status Register (Register 22).

written to the RTD module.

being configured.

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