Siemens Milltronics BW500, Руководство по эксплуатации

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Operation
8.8 mA I/O (0/4-20 mA)
BW500 and BW500/L
Operating Instructions, 12/2016, A5E33482052-AD
101
8.8 mA I/O (0/4-20 mA)
Output
The standard BW500 and BW500/L provides one isolated mA output. The output can be
assigned (P201) to represent rate, load or speed. The output range can be set to 0 - 20 mA or 4
- 20 mA (P200). The 0 or 4 mA value corresponds to empty or zero condition, whereas the 20
mA value corresponds to the associated design value: rate (P011), load (P952), or speed
(P014). The mA output can be limited for over range levels of 0 mA minimum and 22 mA
maximum (P212 and P213 respectively). The output 4 and 20 mA levels can also be trimmed
(P214 and P215 respectively) to agree with a milliammeter or other external mA device.
The mA output value can be tested to output a prescribed value using parameter P911. Refer to
P911 (Page 190)
.
The optional mA I/O board provides two additional mA outputs
1)
, programmable as outputs 2 and
3, using the same parameters as the standard output (1). If programmed for PID control, output
2 is assigned to PID control loop 1 and output 3 is assigned to PID control loop 2.
1)
not available with BW500/L
Input
The optional mA I/O board provides two mA inputs, programmable as inputs 1 and 2. If
programmed for PID control, generally, input 1 is assigned to PID control loop 1 and input 2 is
assigned to PID control loop 2.
The input range can be set to 0-20 mA or 4-20 mA (P250), and assigned a function (P255), for
example: PID setpoint. The 4 and 20 mA levels can be trimmed (P261 and P262) to agree with
an external device. The external device could be a moisture sensor, or an inclinometer.
Note
mA inputs not available with BW500/L