Watlow Series SD6 PID Controller with DeviceNet Addendum - Manual (Page 7)

Wa t l o w S e r i e s S D 6 P I D w i t h D e v i c e N e t ■ 7 ■
Poll Connection
The poll connection allows the master to write set point and process value in one connection. It also allows the reading of
all process value, set point and alarm status.
Table 14. Static Input – Instance 101 in the Assembly Object - 7 bytes
Table 15. Static Output – Instance 100 in the Assembly Object - 5 bytes
Byte(s) Parameter and Description Size of Data Range
0-3 Closed Loop Set Point - Control
set point used in the auto mode DINT -1999.000 to 9999.000
4 Control Modes -
Breakdown of byte: USINT
Bit 0: Selects whether the
controller is in the auto or
manual mode. (0) Auto mode
(1) Manual mode
Bit 1: Selects whether the set
point adjustment is done via
the SD front panel or
through DeviceNet (0) DeviceNet
(1) SD front panel
Bit 2: Selects whether
Auto/Manual mode selection
is done via the SD front
panel or through DeviceNet. (0) DeviceNet
(1) SD front panel
Bit 3 to Bit 7: Not used N/A
Byte(s) Parameter and Description Size of Data Range
0 Exception Status Byte - Byte
reserved for future use. USINT Always returns a value of
zero.
1-4 Process Value- Actual value of
process input DINT -1999.000 to 9999.000
5 Alarm Status - Indicates when
alarm outputs are in alarm con-
dition.
Breakdown of byte:
Bit 0: alarm low 1 status
Bit 1: alarm high 1 status
Bit 2: alarm low 2 status
Bit 3: alarm high 2 status
Bit 4 to bit 7: unused
USINT For each bit:
(0) None
(1) Alarm
6 Control Mode -
Breakdown of byte:
Bit 0: monitor the auto / manu-
al status.
Bit 1 to bit 7: unused
USINT (0) Auto mode
(1) Manual mode