Rockwell Automation 1771-TCM,D17716.5.108 TEMPERATURE CONTROL MOD - Manual (Page 44)

Chapter
6
6-1
Operating the Module
This chapter shows you how to control the dynamic block that you send to
the 1771-TCM module to control operation of the loops. This includes.
sequence of block-transfers
block
identification
inferred decimal point
the dynamic block
At initial start-up, you must write (block-transfer) the dynamic block to the
1771-TCM module to establish its mode of operation. After that, you must
send a dynamic block to the module any time you want to change its
operating mode.
Thru the dynamic block you also control the module’s response to the
execution of a block-transfer read instruction. The module can send either
a gains block or a system status block in response to a a block-transfer read
execution. Whenever you want the module to switch from sending the
system status block to sending the gains block or switch from sending the
gains block to sending the system status block, you must send a dynamic
block to establish that mode of response to block-transfer reads.
The first word of each dynamic block contains a block identification code
(1000 1000 0000 1010 or 880A
16
) that you use to tell the module that it is
a dynamic block.
For the manual output value (CV), the run temperature set-point value, and
the standby temperature set-point value, you enter a 16-bit signed integer
value. However, as you enter the value you must be aware of an inferred
decimal point.
For the manual output value (CV) , the inferred decimal point is 2
places from the right (causing the resolution to be 0.01).
For the run temperature set-point value, and the standby temperature
set-point value, the inferred decimal point is 1 place from the right
(causing the resolution to be 0.1).
Chapter Objectives
Sequence of BlockĆtransfers
Block Identification
Inferred Decimal Point