31
Column r - relays
Block
Parameter
Range
r1
Output 1 Assignment
AM, where A and M are Assignment
and Mode choices from the table on
page 32.
00 for totalizers
91 for batchers
r2
Output 1 Timeout
0.01 - 99.99 seconds
1.00 for totalizers
Latch for batchers
r3
Output 2 Assignment
AM, where A and M are Assignment
and Mode choices from the table on
page 32.
21 for totalizers
71 for batchers
r4
Output 2 Timeout
0.01 - 99.99 seconds
1.00 for totalizers
Latch for batchers
In the batcher, relay 1 is dedicated as the batch final output. It cannot be programmed
to do any other function. Relay 2 in the batcher and both relays in the totalizer are
indeed programmable. The output assignment (should the output turn ON at a rate
or count setpoint, or each time a unit of flow is counted?), and the output mode
(should the output turn OFF at a count or rate setpoint or an unlatch input, or after a
programmable timeout?) are set in this column.
For a totalizer, there are three events that can occur that can cause an output to turn
ON. You get to pick the event as the assignment. The events are when the totalizer
count reaches the totalizer preset value (totalizer setpoint), when the displayed rate
reaches a high or low (or either) setpoint (rate high, rate low, rate low/high), and
when a unit of flow is counted (totalizer scaled pulse out). This may be a good time
to mention that if the totalizer is programmed to 10 digit total (block d2 = 0), the
totalizer will not have a setpoint, and no output can occur. Once the assignment is
determined, the mode must be selected. There are four modes: timed, latched,
follows, and pulsed, but only certain modes are appropriate for each assignment.
The totalizer setpoint can be timed, in which case the output will turn OFF after a
programmed timeout, or latched, in which case the output will turn OFF after an
unlatch input occurs. Rate low and rate high assignments can be timed or latched,
or can be follows. Follows mode means that the output will turn OFF automatically
when the rate goes back above a rate low setpoint, or below a rate high setpoint. The
rate low/high assignment is follows only. Rate low/high means that the ratemeter
has a low setpoint and a high setpoint; the output is ON when the rate is lower than
PROGRAMMING cont.
