Rockwell Automation 1771-N SERIES High Resolution Analog Module User Manual User Manual

Page 129

Block Transfer Write and Block Transfer Read Configurations for 1 Output/7 Input 1771-N Series Modules

F–7

Publication 1771ĆUM127B-EN-P - December 2002

Block Transfer Read Bit/Word Description for 1 Output/7 Input

Module

Word

Decimal Bit

(Octal Bit)

Definition

Word 0

Bits 00-15

(00-17)

Always = 8800 hexadecimal

Bits 00-05

Not used. Always 0

Bit 06

Bad structure. This bit is set if there is an error in the BTW

header.

Word 1

Bit 07

Bad program. This bit is set if any of the module level

programming data is illegal.

Bit 08 (10)

Module fault. This bit is set if any of the programming data sent

to the module in the most recent BTW was illegal, or if one or

more channels has the bad calibration bit set.

Bits 09-10

(11-12)

Program verify. Indicates the result of verify request. 00 = verify

not requested; 10 = verify failed; 11 = verify succeeded

Bit 11 (13)

I/O reset. This bit is set whenever the I/O reset line on the

backplane is asserted.

Bit 12 (14)

RTS timeout. This bit is set if a BTR was not requested of the

module within the RTS sample time.

Bit 13 (15)

Module alarm. This bit is set if there is an alarm bit set for one

or more channels. The input alarm bits are low, high alarm and

rate alarm. The output channel alarm bits are low and high

clamp, and the rate limit alarm.

Bit 14 (16)

Bad channel data. This bit is set if the module is in BCD mode

and one or more of the input data values sent in the last BTW

are not a legal BCD value.

Bit 15 (17)

Powerup bit. This bit is set until a BTW with programming data

is received by the module.

Bit 00

Cold junction compensation (CJC) underrange bit. This bit is

set if the CJC temperature is below 0

Word 2

Bit 01

Cold junction compensation (CJC) overrange bit. This bit is set

if the CJC temperature is above 70

Bits 02-14

(02-16)

Not used. Always 0.

Bit 15 (17)

Always 1.

Word 3

Bits 00-15

(00-17)

Cold junction temperature. Units of 0.01 degrees C or 0.1

degrees F. (0.1 degrees C or 1.0 degrees F in BCD.)