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19 BUILT-IN I/O FUNCTION
19.5 FX3-Compatible Pulse Catch Function
19.5 FX3-Compatible Pulse Catch Function
This section explains the FX3-compatible pulse catch function.
Outline of FX3-compatible pulse catch function
An FX3-compatible pulse catch function is mounted on the CPU module,
When the input signal X0 to X7 turns OFFON, a special relay (SM8170 to SM8177) is immediately set to ON by interrupt
processing. Use of these special relays in a normal sequence program enables pulse signals that are incompletely sampled in
regular input processing to be caught.
To use the FX3-compatible pulse catch function, pulse catch setting and the input response time must be set with parameters.
Functions equivalent to the MELSEC Q/L series pulse catch function are also mounted. For details of functions, refer to
Page 184 Pulse Catch Function.
The pulse catch function and FX3-compatible pulse catch function can be used simultaneously.
Specifications of FX3-compatible pulse catch function
This specifications of the FX3-compatible pulse catch function are explained below.
Performance specifications
FX3-compatible pulse catches can be used on inputs X0 to X7.
■Input response time
Input response times are shown below.
■Assignment of input numbers and special relays
The assignments of input numbers and special relays are explained below.
FX5U-32M, FX5UC-32M FX5U-64M, FX5U-80M Input response time
X0 to X5 X0 to X7 5 s
X6 to X7 100 s
Input number Corresponding special relay
X0 SM8170
X1 SM8171
X2 SM8172
X3 SM8173
X4 SM8174
X5 SM8175
X6 SM8176
X7 SM8177