SMC Networks ITV1000 Series Operation Manual page 8

Pressure setting and output monitoring
Pressure can be set by sending the input data, in which F.S. consists of 12
bits, to the E/P regulator through master PLC(inputting target value to 0 area).
<Input data formula>
"Set pressure"/"F.S. pressure range" x 4095
The value obtained by this formula is converted to a hexadecimal number for sending.
EX.) To set pressure at 0.3MPa by ITV203*(for 0.5MPa type)
(0.3MPa/0.5MPa)×4095＝2457（DEC）＝999(HEX)
0.3MPa of pressure is set by sending input data of "999" to the electromagnetic
regulator through the master PLC.
Output condition can be monitored by reading the data of I area or diagnostic area. Refer
to the description below for detailed allocation of data.
Communication data allocation
Target value
(0 area)
Output pressure
(I area)
Diagnosis(DIAG)
Note : Although 100%F.S. for target value is 12bit, communication is available up to 150%F.S.
(accuracy is guaranteed up to 100%F.S.). Over range error is output when 150%F.S. is exceeded.
Output pressure at this time is controlled by the input data immediately before the error
occurred.
Set target value
Resolution : 12bit (100%F.S.), Occupied byte : 2 Byte
目標値（下位12bit）
*
0 0 0 0 圧力値
Target value(Lower 12 bits)
b15 b11
Put 0 in upper 4 bits (Note)
Monitor the output pressure.
Resolution : 12bit (100%F.S.), Occupied byte : 2 Byte
出力圧力値（下位12bit）
*
0 0 0 0 圧力値
Output pressure(Lower 12 bits)
b15 b11
Resolution may exceed 12bit depending on control
conditions.
Monitor the product error.
7 bytes are occupied for external diagnosis data.
Allocate data below to byte 7 as a diagnosis.
Byte
0 0 0 0 0 0
7
b7
①Internal diagnostic error 0: No error 1: Error
② Over range error 0: No error 1: Error
―8―
② ①
b0
b0
b0