21
Parameter Description BYTE
SP Setpoint The SP has 5 bytes, 4 bytes for the float value 4+1=5
and one status byte. The status byte needs to be
128 (0x80Hex) or higher for the D3 to accept it.
READBACK Position The READBACK has 5 bytes, 4 bytes for the 4+1=5
float value and one status byte.
POS_D Digital position Returns actual position as a digital value with 2
definitions as below
0 = Not initialized
1 = Closed
2 = Opened
3 = Intermediate
CHECKBACK Detailed information of the device, coded bit wise. 3
Several messages can occur at the same time.
RCAS_IN Remote Cascade The RCAS_IN has 5 bytes, 4 bytes for the 4+1=5
float value and one status byte.
RCAS_OUT Remote Cascade The RCAS_OUT has 5 bytes, 4 bytes for 4+1=5
the float value and one status byte.
Status Byte Table
MSB LSB Meaning D3 info
0 0 0 0 1 0 x x Not connected
0 0 0 0 1 1 x x Device failure PROFIbus PA module failure
0 0 0 1 0 0 x x Sensor failure No sensor value
0 0 0 1 1 1 x x Out of service AI Function Block in O/S mode
1 0 0 0 0 0 x x Good - Non cascade Measured value OK
All Alarm values used
1 0 0 0 0 0 0 0 OK
1 0 0 0 1 0 0 1 Below low limit Lo Advisory alarm
1 0 0 0 1 0 1 1 Above high limit Hi Advisory alarm
1 0 0 0 1 1 0 1 Lo-Lo Critical alarm
1 0 0 0 1 1 1 1 Hi-Hi Critical alarm
Example SP = 43.7% and 50%
Float Hex Status
43.7 42 2E CC CD 80
50.0 42 48 00 00 80
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