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APPENDICES
APPENDICES
Appendix 1 Directions for Use
(1) For the master station, you can select whether data is cleared or held when a
communication error or WDT error occurs or when remote device power switches
off, using the condition setting switch.
Make setting according to the system.
*The above error can be confirmed by monitoring the link special registers for
other station communication status in the master station.
When the error has occurred, the status of the corresponding station is stored into
the following area in bit pattern.
SW0080 to SW0083: Data link status (0: normal, 1: data link error occurrence)
SW0084 to SW0087: WDT error status (0: normal, 1: WDT error occurrence)
(2) For the remote device station, you can select whether the external output
(coincidence) status is held or cleared when a communication error, programmable
controller CPU stop or master station reset is detected, using the external output
hold/clear setting area of the remote register {most significant bit of address
RWwn+2}.
As the external output hold/clear setting is used for both CH1 and CH2, set it to
the remote register of CH1.
Address
RWwm+2(CH1)
(3) When a hardware reset or WDT error occurs, the external output (coincidence
output) is forcibly switched off.
15
0
0
0
4 bits
Counter function
selection register
(Refer to Chapter 9)
External output hold/clear setting
0: Clear
1: Hold
Appendix - 1
MELSEC-A
Set in hexadecimal.
0
8 bits
Pulse input mode register
(Refer to Sections 5.1, 5.2)
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