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3-1
Section
Analog I/O Units
167
Item
Voltage I/O
Current I/O
Analog
I
Number of inputs
2
g
Input
Section
Input signal range
0 to 10 V/1 to 5 V
4 to 20 mA
Section
Max. rated input
±
15 V
±
30 mA
External input impedance
1 M
Ω
min.
250
Ω
rated current
Resolution
1/256
Accuracy
1.0% full scale
A/D conversion data
8-bit binary
Analog
O
Number of outputs
1
g
Output
Section
(See
Output signal range
0 to 10 V or
–10 to 10 V
4 to 20 mA
(See
note 1.)
Max. external output current
5 mA
---
note 1.)
Allowable external output load resistance
---
350
Ω
Resolution
1/256 (1/512 when the output signal range is –10 to 10 V)
Accuracy
1.0% of full scale
Set data
8-bit signed binary
Conversion time
10 ms max. per Unit (See note 2.)
Isolation method
Photocoupler isolation between I/O terminals and PC signals.
No isolation between analog I/O signals.
Note
1. With analog outputs it is possible to use both voltage outputs and current
outputs at the same time. In this case however, the total output current must
not exceed 21 mA.
2. The conversion time is the total time for 2 analog inputs and 1 analog output.
Part Names
Analog I/O terminals
Expansion I/O connecting cable
Expansion connector
Connected to analog I/O devices.
Connected to the CPU Unit or previous Expansion Unit. The cable is provided
with the Unit and cannot be removed.
Caution
Do not touch the cables during operation. Static electricity may cause operating
errors.
Connected to the next Expansion Unit or Expansion I/O Unit.
Analog I/O Terminals
Expansion I/O
Connecting Cable
Expansion Connector