JPX implemented TradeGuard on July 2016 with the start of J-GATE and offered order/risk management functions to our Trading Participants.
TradeGuard has the following 4 basic functions/
- Pre-trade Risk Check
- At-trade Risk Check
- Manual Block
- Mass Cancel (batch cancelling of orders)

Regarding TradeGuard, it is described in FAQ.

[FAQ] System Support FAQ > J-GATE > TradeGuard
URL: https://faqsd.jpx.co.jp/category/show/244?site_domain=en_application