Baldor NextMove BX, Руководство по установке

Страница: 26 / 94

NextMove BX Installation Manual for Mint™ v4
14
MN1258V4 08/2000
Connector J1:
Pin No Signal Function
1 din 8 Digital input bit 8
2
din 9
Digital input bit 9
3 din 10 Digital input bit 10
4 din 11 Digital input bit 11
5 din 12 Digital input bit 12
6
din 13
Digital input bit 13
7 din 14 Digital input bit 14
8 din 15 Digital input bit 15
9 usr-com Common reference for Inputs
10
usr-com
Common reference for Inputs
Inputs may be 12 to 24V positive or negative with respect to usr-com . usr-com is shared with the
interrupt inputs.
The sixteen digital inputs are optically isolated using ac input isolators. One input pin of each device
is connected to the common reference. This common rail may be connected to a positive voltage,
e.g.
usr-V+, for use with NPN drive transistors or low-side switches. Alternatively the common rail
may be connected to a negative voltage, e.g. usr-gnd , for use with PNP drive transistors or high-side
switches.
In either case the user provides an external supply which drives the inputs with a voltage in the range
12V to 24V ±20%.
The voltage applied to the inputs should be in the range 12 to 24V ±20% (9.6 to 28.8V) above or
below the
usr-com rail to activate the inputs. If the voltage exceeds the maximum stated, the input
circuit may overheat and be damaged The voltage applied should be less than 3V above or below the
usr-com rail to deactivate the inputs.
The inputs have low pass filters and Schmitt trigger buffers An input pulse must have a duration of at
least 2ms (one software scan) to guarantee acceptance by the application program. Pulses below 2ms
are not guaranteed to be ignored.
Figure 3-5: Digital Input Circuit