Red Lion PAXCDC4 (MODBUS) - Manual (Page 6)

6
Coils 1-4: Output Coils
These coils are used to read or change the states of the Setpoint Outputs.
To change the state of the output(s), the output(s) must be in manual mode.
Refer to the CSR or MMR/SOR registers in the Manual Mode Description
section.
Coils 5-10: Reset Coils
These coils are used to perform the Reset command for the values listed.
Forcing the coil “on” causes the appropriate value in the unit to be reset.
The coil is cleared after the command is executed, therefore, the coil value
read will always be 0 (zero).
Coils 11-29: Polling Coils
The MODBUS card is continually requesting values from the PAX unit. The
polling bit coils determine what values are requested during each loop.
Setting the coils to “1” enables the card to poll that particular value. A “0”
value disables it. Turning polling coils off allows the user to request fewer
values and therefore decreases the internal loop time, which allows the
values that are polled to be updated more often.
If a MODBUS read is issued for any value, that value is automatically
updated to the latest value, regardless of whether the polling bit is on or
off. On power up, all values are updated regardless of Polling bit settings.
Polling coil values are saved in E
2 PROM memory. Factory settings is “on”
for all Polling coils.
**Update time is the typical time to update the internal memory provided no
MODBUS requests are incoming.
Coils 21-29 (PAX), Coils 31-49 (PAXI/DR/CK/TM): Terminating
Coils
This set of coils determines what terminating character is sent to the
PAX meter when a write command is executed. If the flag is 0, a $ is used
as the terminating character and the value is not saved to E
2 PROM
memory in the PAX. If the flag is 1, an * is used as the terminating
character and the value is saved to E
2 PROM memory in the PAX.
Coil 30: Response Delay
When a write command is issued, the new value is written to the PAX. If
the coil is off, the
MODBUS write response is not issued until the value is
read back from the PAX. For MODBUS reads, if a polling coil is off, the
response is not issued until the latest value is read back from the PAX. If
the coil is set “on” the
MODBUS response is issued as soon the received
command is complete. The write coil is saved in E 2 PROM memory.
Factory setting is on.
COIL DESCRIPTIONS
TYPICAL UPDATE TIMES**
PAX PAXI/DR/CK/TM
All values (10) - 1.15 sec All values (19) - 900 msec
5 values - 500 msec 10 values - 480 msec
1 value - 100 msec 5 values - 230 msec
1 value - 52 msec